libmsc/ran_conn.c: add missing 'break' to OSMO_RAT_EUTRAN_SGS

Change-Id: I18dfd08ea0857f2751164a295dd9de20a2024ac3
Fixes: CID#190874
diff --git a/src/libmsc/ran_conn.c b/src/libmsc/ran_conn.c
index be6bde0..79709c6 100644
--- a/src/libmsc/ran_conn.c
+++ b/src/libmsc/ran_conn.c
@@ -683,6 +683,7 @@
 		break;
 	case OSMO_RAT_EUTRAN_SGS:
 		conn->log_subsys = DSGS;
+		break;
 	default:
 		conn->log_subsys = DMSC;
 		break;