digsig: fix digsig_inode_permission() signature

Type signature for security_operations member inode_permission has
changed. Removed parameter nd.

Signed-off-by: Rupert Muchembled <rupert@rmuch.net>
digsig: delete digsig_exit_module()

Function digsig_exit_module() may be deleted, since this module will
not be unloaded.

Signed-off-by: Rupert Muchembled <rupert@rmuch.net>
digsig: remove include for linux/config.h in dsi_sysfs.c

Remove inclusion of deleted header linux/config.h from dsi_sysfs.c.

Signed-off-by: Rupert Muchembled <rupert@rmuch.net>
digsig: fix incorrect format specifier in digsig_revoked_store()

Fix use of incorrect format specifier for size_t type in debug message
in digsig_revoked_store().

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