OM2000: Fix state machien for CF/TRXC on START Result

When receiving the 'Start Result' message, for CF and TRXC MO
we directly transition to performing the Operational Info.  In that
case, we need to return after sending the Operational Info and skip
the usual processing for the default case below.

Change-Id: I99860d198b337ffe461b240bda20dc10e1b5b2cb
diff --git a/openbsc/src/libbsc/abis_om2000.c b/openbsc/src/libbsc/abis_om2000.c
index 58d86c6..aeac876 100644
--- a/openbsc/src/libbsc/abis_om2000.c
+++ b/openbsc/src/libbsc/abis_om2000.c
@@ -1518,7 +1518,7 @@
 		osmo_fsm_inst_state_chg(fi, OM2K_ST_WAIT_OPINFO_ACCEPT,
 				OM2K_TIMEOUT, 0);
 		abis_om2k_tx_op_info(omfp->trx->bts, &omfp->mo->addr, 1);
-		break;
+		return;
 	case OM2K_MO_CLS_DP:
 		/* Transition directoy to WAIT_ENABLE_ACCEPT */
 		osmo_fsm_inst_state_chg(fi, OM2K_ST_WAIT_ENABLE_ACCEPT,