fix issue #626 and [TBASE-1192]

src/modules/http/src/httpSession.c

@@ -114,10 +114,10 @@ void httpRestoreSession(HttpContext *pContext) {
     return;
   }
   session->access--;
-  pContext->session = NULL;
   httpTrace("context:%p, ip:%s, user:%s, restore session:%p:%p, access:%d, expire:%d",
             pContext, pContext->ipstr, pContext->user, session, session->taos,
             session->access, pContext->session->expire);
+  pContext->session = NULL;
   pthread_mutex_unlock(&server->serverMutex);
 }