idr: remove unused prototype of idr_free()

There is no such function. Remove the redundant prototype.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
1 file changed