Make nfs_file_cred more robust.
As not all files have an associated open_context (e.g. device special files), it is safest to test for the existence of the open context before de-referencing it. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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18de9735
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