digsig: remove unused variable from digsig.c

Remove unused variable 'secondary' from digsig.c.

Signed-off-by: Rupert Muchembled <rupert@rmuch.net>
digsig: clean up after failure to register LSM

Jump to out_sysfs to clean up after failure to register the security
module operations.

Signed-off-by: Rupert Muchembled <rupert@rmuch.net>
digsig: fix spacing issues in digsig.c

Fix spacing issues reported by checkpatch.pl in digsig.c.

Signed-off-by: Rupert Muchembled <rupert@rmuch.net>