Assorted coverity fixes (#42738)

Coverity is back online, and it's not happy

src/core/load-fragment.c

@@ -6823,8 +6823,10 @@ int config_parse_luo_sessions(
                                    "Failed to parse LUOSession= value, ignoring: %s", rvalue);
                         return 0;
                 }
-                if (r == 0)
+                if (r == 0) {
+                        strv_sort(*sessions);
                         return 0;
+                }
 
                 if (!luo_session_name_is_valid(word)) {
                         log_syntax(unit, LOG_WARNING, filename, line, 0,
@@ -6842,6 +6844,4 @@ int config_parse_luo_sessions(
                 if (r < 0)
                         return log_oom();
         }
-
-        strv_sort(*sessions);
 }

src/libsystemd-network/dhcp-message-dump.c

@@ -895,6 +895,8 @@ static int dump_dhcp_option_one(Table *table, sd_dhcp_message *message, uint8_t
         bool fallback = false;
         if (type == DHCP_OPTION_TYPE_AUTO) {
                 type = dhcp_option_type_from_code(code);
+                if (type < 0)
+                        return type;
                 fallback = true;
         }
 

src/libsystemd/sd-future/test-fiber-ops.c

@@ -422,8 +422,6 @@ static int loop_write_zero_blocking_reader_fiber(void *userdata) {
         _cleanup_free_ char *buf = malloc(ctx->total);
         ASSERT_NOT_NULL(buf);
         ssize_t n = loop_read(ctx->pipefd[0], buf, ctx->total, /* do_poll= */ true);
-        if (n < 0)
-                return (int) n;
         return (int) n;
 }