collapse two distinct calls into single RenameData() call (#12093)

This is an optimization by reducing one extra system call,
and many network operations. This reduction should increase
the performance for small file workloads.

cmd/erasure-multipart.go

@@ -912,7 +912,7 @@ func (er erasureObjects) CompleteMultipartUpload(ctx context.Context, bucket str
 
 	// Rename the multipart object to final location.
 	if onlineDisks, err = renameData(ctx, onlineDisks, minioMetaMultipartBucket, uploadIDPath,
-		fi.DataDir, bucket, object, writeQuorum, nil); err != nil {
+		partsMetadata, bucket, object, writeQuorum); err != nil {
 		return oi, toObjectErr(err, bucket, object)
 	}