add retry on lock to core sql func

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@6508 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core_db.c

@@ -79,7 +79,7 @@ SWITCH_DECLARE(const char *) switch_core_db_errmsg(switch_core_db_t *db)
 
 SWITCH_DECLARE(int) switch_core_db_exec(switch_core_db_t *db, const char *sql, switch_core_db_callback_func_t callback, void *data, char **errmsg)
 {
-	int ret;
+	int ret = 0;
 	int sane = 100;
 
 	while(--sane > 0) {