socket-util: Replace sockaddr length macros with functions

There's no need for these to be macros, let's just make them regular
functions instead.

src/libsystemd/sd-bus/sd-bus.c

@@ -1030,7 +1030,7 @@ static int parse_container_unix_address(sd_bus *b, const char **p, char **guid)
                 /* Note that we use the old /var/run prefix here, to increase compatibility with really old containers */
                 .sun_path = "/var/run/dbus/system_bus_socket",
         };
-        b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
+        b->sockaddr_size = sockaddr_un_len(&b->sockaddr.un);
         b->is_local = false;
 
         return 0;

src/libsystemd/sd-journal/journal-send.c

@@ -230,7 +230,7 @@ _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
         };
         struct msghdr mh = {
                 .msg_name = (struct sockaddr*) &sa.sa,
-                .msg_namelen = SOCKADDR_UN_LEN(sa.un),
+                .msg_namelen = sockaddr_un_len(&sa.un),
         };
         ssize_t k;
         bool have_syslog_identifier = false;

src/libsystemd/sd-resolve/test-resolve.c

@@ -84,7 +84,7 @@ int main(int argc, char *argv[]) {
 
         /* Make an address -> name query */
         sa.in.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
-        r = sd_resolve_getnameinfo(resolve, &q2, &sa.sa, SOCKADDR_LEN(sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
+        r = sd_resolve_getnameinfo(resolve, &q2, &sa.sa, sockaddr_len(&sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
         if (r < 0)
                 log_error_errno(r, "sd_resolve_getnameinfo(): %m");