Merge pull request #2881 from taosdata/feature/platform

unlock dbmutex while create vgroup failed

src/mnode/src/mnodeVgroup.c

@@ -450,6 +450,7 @@ int32_t mnodeGetAvailableVgroup(SMnodeMsg *pMsg, SVgObj **ppVgroup, int32_t *pSi
   }
 
   if (pDb->numOfVgroups < 1) {
+    pthread_mutex_unlock(&pDb->mutex);
     mDebug("app:%p:%p, db:%s, failed create new vgroup since:%s, numOfVgroups:%d maxVgroupsPerDb:%d ",
            pMsg->rpcMsg.ahandle, pMsg, pDb->name, tstrerror(code), pDb->numOfVgroups, maxVgroupsPerDb);
     return code;