ovl: do not fail when setting origin xattr

Comment above call already says this, but only EOPNOTSUPP is ignored, other
failures are not.

For example setting "user.*" will fail with EPERM on symlink/special.

Ignore this error as well.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/copy_up.c

@@ -354,7 +354,8 @@ int ovl_set_origin(struct ovl_fs *ofs, struct dentry *dentry,
 				 fh ? fh->fb.len : 0, 0);
 	kfree(fh);
 
-	return err;
+	/* Ignore -EPERM from setting "user.*" on symlink/special */
+	return err == -EPERM ? 0 : err;
 }
 
 /* Store file handle of @upper dir in @index dir entry */