Commit 9bea7f23 renamed use_module to
ref_module (and changed its return value), but forgot to update this
prototype in module.h.
Signed-off-by: NAnders Kaseorg <andersk@ksplice.com>
Acked-by: NWANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>