[td-225] fix bugs in regression test.

src/client/src/tscSql.c

@@ -264,12 +264,13 @@ void taos_close(TAOS *taos) {
   }
 
   SSqlObj* pHb = pObj->pHb;
-  if (pHb != NULL) {
+  if (pHb != NULL && atomic_val_compare_exchange_ptr(&pObj->pHb, pHb, 0) == pHb) {
     if (pHb->pRpcCtx != NULL) {  // wait for rsp from dnode
       rpcCancelRequest(pHb->pRpcCtx);
+      pHb->pRpcCtx = NULL;
     }
 
-    pObj->pHb = NULL;
+    tscDebug("%p, HB is freed", pHb);
     taos_free_result(pHb);
   }
 

src/util/src/tcache.c

@@ -266,7 +266,6 @@ void *taosCacheAcquireByKey(SCacheObj *pCacheObj, const void *key, size_t keyLen
 
   if (taosHashGetSize(pCacheObj->pHashTable) == 0) {
     atomic_add_fetch_32(&pCacheObj->statistics.missCount, 1);
-    uError("cache:%s, key:%p, not in cache, retrieved failed, reason: empty cache", pCacheObj->name, key);
     return NULL;
   }