nuke handle on errs worse than 500 rather than 900

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@16571 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_sofia/sofia_reg.c

@@ -1448,7 +1448,7 @@ void sofia_reg_handle_sip_r_register(int status,
 									 nua_t *nua, sofia_profile_t *profile, nua_handle_t *nh, sofia_private_t *sofia_private, sip_t const *sip,
 									 tagi_t tags[])
 {
-	if (status >= 900) {
+	if (status >= 500) {
 		if (sofia_private && sofia_private->gateway) {
 			nua_handle_destroy(sofia_private->gateway->nh);
 			sofia_private->gateway->nh = NULL;