[Minor] Remove unused-but-set variables

../src/libserver/url.c: In function ‘rspamd_url_host_set_add’:
../src/libserver/url.c:3808:11: warning: variable ‘k’ set but not used [-Wunused-but-set-variable]
 3808 |  khiter_t k;
      |           ^

../src/lua/lua_task.c: In function ‘lua_task_has_urls’:
../src/lua/lua_task.c:2406:11: warning: variable ‘need_emails’ set but not used [-Wunused-but-set-variable]
 2406 |  gboolean need_emails = FALSE, ret = FALSE;
      |           ^~~~~~~~~~~

src/libserver/url.c

@@ -3941,11 +3941,10 @@ bool
 rspamd_url_host_set_add (khash_t (rspamd_url_host_hash) *set,
 								struct rspamd_url *u)
 {
-	khiter_t k;
 	gint r;
 
 	if (set) {
-		k = kh_put (rspamd_url_host_hash, set, u, &r);
+		kh_put (rspamd_url_host_hash, set, u, &r);
 
 		if (r == 0) {
 			return false;
@@ -3991,4 +3990,4 @@ rspamd_url_host_set_has (khash_t (rspamd_url_host_hash) *set, struct rspamd_url
 	}
 
 	return false;
-}
+}

src/lua/lua_task.c

@@ -2423,13 +2423,13 @@ lua_task_has_urls (lua_State * L)
 {
 	LUA_TRACE_POINT;
 	struct rspamd_task *task = lua_check_task (L, 1);
-	gboolean need_emails = FALSE, ret = FALSE;
+	gboolean ret = FALSE;
 	gsize sz = 0;
 
 	if (task) {
 		if (task->message) {
 			if (lua_gettop (L) >= 2) {
-				need_emails = lua_toboolean (L, 2);
+				lua_toboolean (L, 2);
 			}
 
 			if (kh_size (MESSAGE_FIELD (task, urls)) > 0) {