zero out buffer on (null)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@14328 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core_db.c

@@ -59,7 +59,8 @@ SWITCH_DECLARE(const unsigned char *) switch_core_db_column_text(switch_core_db_
 {
     const unsigned char *txt = sqlite3_column_text(stmt, iCol);
 
-    if (txt && !strcasecmp((char *)txt, "(null)")) {
+    if (!strcasecmp((char *)stmt, "(null)")) {
+		memset(stmt, 0, 1);
 		txt = NULL;
     }