NFSv4: don't fail on missing fattr in open recover

commit a43ec98b72aae3e330f0673438f58316c3769b84 upstream.

This is an unneeded check that could cause the client to fail to recover
opens.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>