NFS: Fix a bug in nfs_open_revalidate()

We want to set the verifier when the call to nfs4_open_revalidate()
_succeeds_.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 166a833..d58bfb8 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1078,7 +1078,7 @@
 	lock_kernel();
 	verifier = nfs_save_change_attribute(dir);
 	ret = nfs4_open_revalidate(dir, dentry, openflags, nd);
-	if (!ret)
+	if (ret == 1)
 		nfs_set_verifier(dentry, verifier);
 	unlock_kernel();
 out: