remove code disabling T3109 if configured to 0

We no longer permit timers with a 0 value, so this case can never
happen.  Also, if it should happen, I'd rather have a timter expiring
immediately (and breaking something) than not being started in the
first place.

Change-Id: Ibfcdd3ddc0155caee89c501498329bde247621a0
diff --git a/src/libbsc/abis_rsl.c b/src/libbsc/abis_rsl.c
index 9e36f79..3337b90 100644
--- a/src/libbsc/abis_rsl.c
+++ b/src/libbsc/abis_rsl.c
@@ -2910,10 +2910,6 @@
 {
 	struct gsm_bts *bts = lchan->ts->trx->bts;
 
-	/* Disabled, mostly legacy code */
-	if (bts->network->T3109 == 0)
-		return -1;
-
 	osmo_timer_setup(&lchan->T3109, t3109_expired, lchan);
 	osmo_timer_schedule(&lchan->T3109, bts->network->T3109, 0);
 	return 0;