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Change the "show" functions to show some content even if a file cannot
be found.  This is the case for admin-revoked state.
This is primarily useful for debugging - to ensure states are being
removed eventually.

So change several seq_printf() to seq_puts().  Some of these are needed
to keep checkpatch happy.  Others were done for consistency.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>