fix: fix use db deserialize issue

source/common/src/tmsg.c

@@ -2537,10 +2537,7 @@ int32_t tDeserializeSUseDbRspImp(SDecoder *pDecoder, SUseDbRsp *pRsp) {
   if (tDecodeI16(pDecoder, &pRsp->hashSuffix) < 0) return -1;
   if (tDecodeI8(pDecoder, &pRsp->hashMethod) < 0) return -1;
 
-  if (pRsp->vgNum <= 0) {
-    return 0;
-  }
-
+  if (pRsp->vgNum > 0) {
     pRsp->pVgroupInfos = taosArrayInit(pRsp->vgNum, sizeof(SVgroupInfo));
     if (pRsp->pVgroupInfos == NULL) {
       terrno = TSDB_CODE_OUT_OF_MEMORY;
@@ -2556,6 +2553,7 @@ int32_t tDeserializeSUseDbRspImp(SDecoder *pDecoder, SUseDbRsp *pRsp) {
       if (tDecodeI32(pDecoder, &vgInfo.numOfTable) < 0) return -1;
       taosArrayPush(pRsp->pVgroupInfos, &vgInfo);
     }
+  }
 
   if (tDecodeI32(pDecoder, &pRsp->errCode) < 0) return -1;
   if (tDecodeI64(pDecoder, &pRsp->stateTs) < 0) return -1;