compile failed

source/libs/monitor/src/monMsg.c

@@ -267,6 +267,7 @@ int32_t tEncodeSMonDiskDesc(SCoder *encoder, const SMonDiskDesc *pDesc) {
   if (tEncodeI64(encoder, pDesc->size.total) < 0) return -1;
   if (tEncodeI64(encoder, pDesc->size.used) < 0) return -1;
   if (tEncodeI64(encoder, pDesc->size.avail) < 0) return -1;
+  return 0;
 }
 
 static int32_t tDecodeSMonDiskDesc(SCoder *decoder, SMonDiskDesc *pDesc) {
@@ -528,4 +529,4 @@ int32_t tDeserializeSMonVloadInfo(void *buf, int32_t bufLen, SMonVloadInfo *pInf
 void tFreeSMonVloadInfo(SMonVloadInfo *pInfo) {
   taosArrayDestroy(pInfo->pVloads);
   pInfo->pVloads = NULL;
-}
\ No newline at end of file
+}