src: use osmo_timer_setup()

Use new function available in libosmocore to set up timers. Compile
tested only.

Change-Id: Ibcfd915688e97d370a888888a83a7c95cbe16819
diff --git a/openbsc/src/ipaccess/abisip-find.c b/openbsc/src/ipaccess/abisip-find.c
index 5b36272..21d9f22 100644
--- a/openbsc/src/ipaccess/abisip-find.c
+++ b/openbsc/src/ipaccess/abisip-find.c
@@ -200,9 +200,7 @@
 		exit(1);
 	}
 
-	timer.cb = timer_cb;
-	timer.data = &bfd;
-
+	osmo_timer_setup(&timer, timer_cb, &bfd);
 	osmo_timer_schedule(&timer, 5, 0);
 
 	printf("Trying to find ip.access BTS by broadcast UDP...\n");