NFS: Make opened as optional argument in _nfs4_do_open

Check opened, only update it when non-NULL.
It's not needs define an unused value for the opened
when calling _nfs4_do_open.

v3, same as v2.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index dcd39d4..43f1590 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -27,7 +27,6 @@
 	struct inode *dir;
 	unsigned openflags = filp->f_flags;
 	struct iattr attr;
-	int opened = 0;
 	int err;
 
 	/*
@@ -66,7 +65,7 @@
 		nfs_sync_inode(inode);
 	}
 
-	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened);
+	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
 		switch (err) {