om2k: Acknowledge the unknown MCTR messages we get from time to time

This is probably a fault report of some kind, but didn't get any
confirmation or naming from anywhere for it yet.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: I8333093d09f27f61094c7f5854573aa16e4bf28c
diff --git a/src/osmo-bsc/abis_om2000.c b/src/osmo-bsc/abis_om2000.c
index ee5c8d0..c32a5fa 100644
--- a/src/osmo-bsc/abis_om2000.c
+++ b/src/osmo-bsc/abis_om2000.c
@@ -2740,6 +2740,9 @@
 	case OM2K_MSGT_CAPA_RES:
 		rc = abis_om2k_tx_simple(bts, &o2h->mo, OM2K_MSGT_CAPA_RES_ACK);
 		break;
+	case 0x0136:	/* Unknown ... something for MCTR */
+		rc = abis_om2k_tx_simple(bts, &o2h->mo, 0x0134);
+		break;
 	/* ERrors */
 	case OM2K_MSGT_START_REQ_REJ:
 	case OM2K_MSGT_CONNECT_REJ: