nfsd: move check_nfsd_access() call into nfsd_cross_mnt()

Whenever we cross a mount point, we need to check_nfsd_access() for v4.
So move the call into nfsd_cross_mnt() in the place where we actually do
cross.  This avoids the possibility of calling nfsd_cross_mnt() without
the required check_nfsd_access().

Also remove the last arg from check_nfsd_access(), which is always false.

nfsd_cross_mnt() now returns an nfserr rather than an errno.

Signed-off-by: NeilBrown <neil@brown.name>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260717093001.1972119-3-neilb@ownmail.net
Signed-off-by: Chuck Lever <cel@kernel.org>

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