solve some static check questions

src/system/detail/src/mgmtVgroup.c

@@ -289,6 +289,7 @@ int mgmtRetrieveVgroups(SShowObj *pShow, char *data, int rows, SConnObj *pConn)
 
   SDbObj *pDb = NULL;
   if (pConn->pDb != NULL) pDb = mgmtGetDb(pConn->pDb->name);
+  assert(pDb != NULL);
 
   pVgroup = pDb->pHead;
   while (pVgroup != NULL) {

src/system/detail/src/vnodeQueryImpl.c

@@ -4555,8 +4555,7 @@ static void doMerge(SQueryRuntimeEnv *pRuntimeEnv, int64_t timestamp, tFilePage
 }
 
 static void printBinaryData(int32_t functionId, char *data, int32_t srcDataType) {
-  if (functionId == TSDB_FUNC_FIRST_DST || functionId == TSDB_FUNC_LAST_DST || functionId == TSDB_FUNC_FIRST_DST ||
-      functionId == TSDB_FUNC_LAST_DST) {
+  if (functionId == TSDB_FUNC_FIRST_DST || functionId == TSDB_FUNC_LAST_DST) {
     switch (srcDataType) {
       case TSDB_DATA_TYPE_BINARY:
         printf("%ld,%s\t", *(TSKEY *)data, (data + TSDB_KEYSIZE + 1));