[#486] Fix PUT object with negative Content-Length

Signed-off-by: Marina Biryukova <m.biryukova@yadro.com>

api/layer/layer.go

@@ -103,7 +103,7 @@ type (
 	PutObjectParams struct {
 		BktInfo           *data.BucketInfo
 		Object            string
-		Size              uint64
+		Size              *uint64
 		Reader            io.Reader
 		Header            map[string]string
 		Lock              *data.ObjectLock
@@ -528,7 +528,7 @@ func (n *Layer) CopyObject(ctx context.Context, p *CopyObjectParams) (*data.Exte
 	return n.PutObject(ctx, &PutObjectParams{
 		BktInfo:       p.DstBktInfo,
 		Object:        p.DstObject,
-		Size:          p.DstSize,
+		Size:          &p.DstSize,
 		Reader:        objPayload,
 		Header:        p.Header,
 		Encryption:    p.DstEncryption,