fix show dnodes long endpoint issue

src/mnode/src/mnodeDnode.c

@@ -799,7 +799,7 @@ static int32_t mnodeGetDnodeMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pC
   pSchema[cols].bytes = htons(pShow->bytes[cols]);
   cols++;
 
-  pShow->bytes[cols] = 40 + VARSTR_HEADER_SIZE;
+  pShow->bytes[cols] = TSDB_EP_LEN + VARSTR_HEADER_SIZE;
   pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
   strcpy(pSchema[cols].name, "end_point");
   pSchema[cols].bytes = htons(pShow->bytes[cols]);