Streaming bitrot verification support (#7004)

cmd/storage-errors.go

@@ -82,6 +82,9 @@ var errMinDiskSize = errors.New("The disk size is less than the minimum threshol
 // errLessData - returned when less data available than what was requested.
 var errLessData = errors.New("less data available than what was requested")
 
+// errMoreData = returned when more data was sent by the caller than what it was supposed to.
+var errMoreData = errors.New("more data was sent than what was advertised")
+
 // hashMisMatchError - represents a bit-rot hash verification failure
 // error.
 type hashMismatchError struct {