slightly simplify nfs_atomic_open()

Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index c8dd1d0..5f7d9be 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2198,8 +2198,6 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
 		else
 			dput(dentry);
 	}
-	if (IS_ERR(res))
-		return PTR_ERR(res);
 	return finish_no_open(file, res);
 }
 EXPORT_SYMBOL_GPL(nfs_atomic_open);