Remove unused variables

src/core/main.c

@@ -599,8 +599,6 @@ static int config_parse_join_controllers(const char *unit,
                         for (a = arg_join_controllers; *a; a++) {
 
                                 if (strv_overlap(*a, l)) {
-                                        char **c;
-
                                         if (strv_extend_strv(&l, *a) < 0) {
                                                 strv_free(l);
                                                 strv_free_free(t);

src/modules-load/modules-load.c

@@ -57,7 +57,6 @@ static void systemd_kmod_log(void *data, int priority, const char *file, int lin
 #pragma GCC diagnostic pop
 
 static int add_modules(const char *p) {
-        char **t;
         _cleanup_strv_free_ char **k = NULL;
 
         k = strv_split(p, ",");

src/sysctl/sysctl.c

@@ -245,7 +245,6 @@ static int parse_argv(int argc, char *argv[]) {
 
                 case ARG_PREFIX: {
                         char *p;
-                        char **l;
 
                         for (p = optarg; *p; p++)
                                 if (*p == '.')