Mysql result wasn't free'd if converting result had failed.

modules/db_mysql/dbase.c

@@ -346,6 +346,7 @@ static int store_result(db_con_t* _h, db_res_t** _r)
 
 	if (convert_result(_h, *_r) < 0) {
 		LOG(L_ERR, "store_result: Error while converting result\n");
+		mysql_free_result(MYRES_RESULT(*_r));
 		pkg_free((*_r)->data);
 		pkg_free(*_r);