Fix several potential problems found by static analysis.

src/cfg_xml.c

@@ -897,8 +897,10 @@ worker_foreach_callback (gpointer k, gpointer v, gpointer ud)
 	GList                          *cur;
 	GHashTable                     *worker_config;
 
-	if (!worker_options || (worker_config = g_hash_table_lookup (worker_options, &cd->wrk->type)) == NULL ||
-			(cparam = g_hash_table_lookup (worker_config, k)) == NULL) {
+	if (!worker_options || (worker_config = g_hash_table_lookup (worker_options, &cd->wrk->type)) == NULL) {
+		return;
+	}
+	if ((cparam = g_hash_table_lookup (worker_config, k)) == NULL) {
 		/* Try to use universal handler if there is no specific handler */
 		if ((cparam = g_hash_table_lookup (worker_config, "*")) != NULL) {
 			if (cd->wrk->ctx != NULL) {
@@ -1114,6 +1116,10 @@ handle_metric_symbol (struct config_file *cfg, struct rspamd_xml_userdata *ctx,
 			group = "ungrouped";
 		}
 	}
+	else {
+		group = "ungrouped";
+		sym_def->description = NULL;
+	}
 
 	g_hash_table_insert (metric->symbols, sym_def->name, value);
 

src/dkim.c

@@ -579,14 +579,14 @@ rspamd_create_dkim_context (const gchar *sig, memory_pool_t *pool, guint time_ji
 	}
 	if (new->sig_alg == DKIM_SIGN_RSASHA1) {
 		/* Check bh length */
-		if (new->bhlen != g_checksum_type_get_length (G_CHECKSUM_SHA1)) {
+		if (new->bhlen != (guint)g_checksum_type_get_length (G_CHECKSUM_SHA1)) {
 			g_set_error (err, DKIM_ERROR, DKIM_SIGERROR_BADSIG, "signature has incorrect length: %ud", new->bhlen);
 			return NULL;
 		}
 
 	}
 	else if (new->sig_alg == DKIM_SIGN_RSASHA256) {
-		if (new->bhlen != g_checksum_type_get_length (G_CHECKSUM_SHA256)) {
+		if (new->bhlen != (guint)g_checksum_type_get_length (G_CHECKSUM_SHA256)) {
 			g_set_error (err, DKIM_ERROR, DKIM_SIGERROR_BADSIG, "signature has incorrect length: %ud", new->bhlen);
 			return NULL;
 		}

src/expressions.h

@@ -97,7 +97,7 @@ void re_cache_add (const gchar *line, void *pointer, memory_pool_t *pool);
  * @param line symbolic representation
  * @return pointer to regexp data or NULL if regexp is not found
  */
-void * re_cache_check (const const gchar *line, memory_pool_t *pool);
+void * re_cache_check (const gchar *line, memory_pool_t *pool);
 
 /**
  * Remove regexp from regexp cache

src/lua/lua_buffer.c

@@ -106,7 +106,7 @@ static                          gboolean
 lua_io_write_cb (void *arg)
 {
 	struct lua_dispatcher_cbdata					*cbdata = arg;
-	gboolean								 		  res;
+	gboolean										  res = FALSE;
 	rspamd_io_dispatcher_t							**pdispatcher;
 
 	if (cbdata->cbref_write) {