res_pjsip_pubsub: Remove unneeded endpoint unref

When a subscription was being recreated and the endpoint wasn't
found, we were trying to unref the endpoint.  This was causing
FRACKs.  Removed the unref.

ASTERISK-26823 #close

Change-Id: If86d2aecff8fe853c7f38a1bfde721fcef3cd164

res/res_pjsip_pubsub.c

@@ -1478,7 +1478,6 @@ static int sub_persistence_recreate(void *obj)
 		ast_log(LOG_WARNING, "Failed recreating '%s' subscription: The endpoint was not found\n",
 			persistence->endpoint);
 		ast_sorcery_delete(ast_sip_get_sorcery(), persistence);
-		ao2_ref(endpoint, -1);
 		return 0;
 	}