NFS: nfs_find_open_context() may only select open files

[ Upstream commit e97bc66377bca097e1f3349ca18ca17f202ff659 ]

If a file has already been closed, then it should not be selected to
support further I/O.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
[Trond: Fix an invalid pointer deref reported by Colin Ian King]
Signed-off-by: Sasha Levin <sashal@kernel.org>
2 files changed