Merge pull request #2210 from taosdata/origin/hotfix/compile-error-on-centos

fix compile error on centos7

src/util/src/tcache.c

@@ -254,7 +254,7 @@ SCacheObj *taosCacheInitWithCb(int64_t refreshTime, void (*freeCb)(void *data))
     return NULL;
   }
 
-  pthread_attr_t thattr = {0};
+  pthread_attr_t thattr;
   pthread_attr_init(&thattr);
   pthread_attr_setdetachstate(&thattr, PTHREAD_CREATE_JOINABLE);