PTCCH: properly handle RTS.req for PCU_IF_SAPI_PTCCH

Change-Id: Ib204acce1a7e33f6651b9da2a7b4a9b9ae461093
Related: OS#1545
diff --git a/src/osmo-bts-litecell15/lc15_l1_if.c b/src/osmo-bts-litecell15/lc15_l1_if.c
index 1df7941..670263f 100644
--- a/src/osmo-bts-litecell15/lc15_l1_if.c
+++ b/src/osmo-bts-litecell15/lc15_l1_if.c
@@ -161,8 +161,11 @@
 	case GsmL1_Sapi_Pacch:
 		rc = pcu_rx_rts_req_pdtch(fl1h->trx_no, rts_ind->u8Tn,
 			rts_ind->u32Fn, rts_ind->u8BlockNbr);
+		break;
 	case GsmL1_Sapi_Ptcch:
-		// FIXME
+		rc = pcu_rx_rts_req_ptcch(fl1h->trx_no, rts_ind->u8Tn,
+			rts_ind->u32Fn, rts_ind->u8BlockNbr);
+		break;
 	default:
 		break;
 	}