tree-wide: assorted coccinelle fixes

src/resolve/resolvectl.c

@@ -261,10 +261,9 @@ static int resolve_host(sd_bus *bus, const char *name) {
                        (int) strlen(name), c == 0 ? name : "", c == 0 ? ":" : " ",
                        canonical);
 
-        if (c == 0) {
-                log_error("%s: no addresses found", name);
-                return -ESRCH;
-        }
+        if (c == 0)
+                return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
+                                       "%s: no addresses found", name);
 
         print_source(flags, ts);
 
@@ -356,10 +355,9 @@ static int resolve_address(sd_bus *bus, int family, const union in_addr_union *a
         if (r < 0)
                 return bus_log_parse_error(r);
 
-        if (c == 0) {
-                log_error("%s: no names found", pretty);
-                return -ESRCH;
-        }
+        if (c == 0)
+                return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
+                                       "%s: no names found", pretty);
 
         print_source(flags, ts);
 
@@ -2050,10 +2048,10 @@ static int call_domain(sd_bus *bus, char **domain, const BusLocator *locator, sd
                         r = dns_name_is_valid(n);
                         if (r < 0)
                                 return log_error_errno(r, "Failed to validate specified domain %s: %m", n);
-                        if (r == 0) {
-                                log_error("Domain not valid: %s", n);
-                                return -EINVAL;
-                        }
+                        if (r == 0)
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Domain not valid: %s",
+                                                       n);
 
                         r = sd_bus_message_append(req, "(sb)", n, **p == '~');
                         if (r < 0)
@@ -2348,10 +2346,10 @@ static int verb_nta(int argc, char **argv, void *userdata) {
                         r = dns_name_is_valid(*p);
                         if (r < 0)
                                 return log_error_errno(r, "Failed to validate specified domain %s: %m", *p);
-                        if (r == 0) {
-                                log_error("Domain not valid: %s", *p);
-                                return -EINVAL;
-                        }
+                        if (r == 0)
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Domain not valid: %s",
+                                                       *p);
                 }
 
         r = call_nta(bus, clear ? NULL : argv + 2, bus_resolve_mgr, &error);

src/resolve/resolved-dns-packet.c

@@ -1426,7 +1426,7 @@ int dns_packet_read_name(
 
                         n += r;
                         continue;
-                } else if (allow_compression && (c & 0xc0) == 0xc0) {
+                } else if (allow_compression && FLAGS_SET(c, 0xc0)) {
                         uint16_t ptr;
 
                         /* Pointer */
@@ -2241,12 +2241,11 @@ static int dns_packet_extract_answer(DnsPacket *p, DnsAnswer **ret_answer) {
                         if (DNS_PACKET_QR(p)) {
                                 /* Additional checks for responses */
 
-                                if (!DNS_RESOURCE_RECORD_OPT_VERSION_SUPPORTED(rr)) {
+                                if (!DNS_RESOURCE_RECORD_OPT_VERSION_SUPPORTED(rr))
                                         /* If this is a reply and we don't know the EDNS version
                                          * then something is weird... */
-                                        log_debug("EDNS version newer that our request, bad server.");
-                                        return -EBADMSG;
-                                }
+                                        return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                                               "EDNS version newer that our request, bad server.");
 
                                 if (has_rfc6975) {
                                         /* If the OPT RR contains RFC6975 algorithm data, then this

src/resolve/resolved-dnssd.c

@@ -97,15 +97,15 @@ static int dnssd_service_load(Manager *manager, const char *filename) {
         if (r < 0)
                 return r;
 
-        if (!service->name_template) {
-                log_error("%s doesn't define service instance name", service->name);
-                return -EINVAL;
-        }
+        if (!service->name_template)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "%s doesn't define service instance name",
+                                       service->name);
 
-        if (!service->type) {
-                log_error("%s doesn't define service type", service->name);
-                return -EINVAL;
-        }
+        if (!service->type)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "%s doesn't define service type",
+                                       service->name);
 
         if (LIST_IS_EMPTY(service->txt_data_items)) {
                 txt_data = new0(DnssdTxtData, 1);

src/resolve/resolved-manager.c

@@ -780,10 +780,8 @@ int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
         l = recvmsg_safe(fd, &mh, 0);
         if (IN_SET(l, -EAGAIN, -EINTR))
                 return 0;
-        if (l < 0)
+        if (l <= 0)
                 return l;
-        if (l == 0)
-                return 0;
 
         assert(!(mh.msg_flags & MSG_TRUNC));