Return errors in PutObject()/PutObjectPart() if input size is -1. (#5015)

Amazon S3 API expects all incoming stream has a content-length
set it was superflous for us to support object layer which supports
unknown sized stream as well, this PR removes such requirements
and explicitly error out if input stream is less than zero.

cmd/fs-v1.go

@@ -537,6 +537,11 @@ func (fs fsObjects) PutObject(bucket string, object string, data *HashReader, me
 		return ObjectInfo{}, toObjectErr(traceError(errFileAccessDenied), bucket, object)
 	}
 
+	// Validate input data size and it can never be less than zero.
+	if data.Size() < 0 {
+		return ObjectInfo{}, traceError(errInvalidArgument)
+	}
+
 	// No metadata is set, allocate a new one.
 	if metadata == nil {
 		metadata = make(map[string]string)