Now that module_enable_ro() has no more external users, make it static
again.
Suggested-by: NJessica Yu <jeyu@kernel.org>
Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com>
Acked-by: NJessica Yu <jeyu@kernel.org>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>