timer: Add function osmo_timer_remaining() to determine remainign time
diff --git a/include/osmocom/core/timer.h b/include/osmocom/core/timer.h
index ecb5001..d37af80 100644
--- a/include/osmocom/core/timer.h
+++ b/include/osmocom/core/timer.h
@@ -73,7 +73,9 @@
 
 int osmo_timer_pending(struct osmo_timer_list *timer);
 
-
+int osmo_timer_remaining(const struct osmo_timer_list *timer,
+			 const struct timeval *now,
+			 struct timeval *remaining);
 /*
  * internal timer list management
  */