modem: fix modem_gmm_prim_up_cb(): add missing break

Change-Id: Ibd16232d76d83d90f27d08b47aa38509161270b6
Fixes: CID#311019
---
M src/host/layer23/src/modem/gmm.c
1 file changed, 11 insertions(+), 0 deletions(-)

diff --git a/src/host/layer23/src/modem/gmm.c b/src/host/layer23/src/modem/gmm.c
index 6a84909..3488162 100644
--- a/src/host/layer23/src/modem/gmm.c
+++ b/src/host/layer23/src/modem/gmm.c
@@ -58,6 +58,7 @@
 			LOGP(DGMM, LOGL_ERROR, "%s(): Rx %s UNIMPLEMENTED\n", __func__, pdu_name);
 			break;
 		};
+		break;
 	default:
 		LOGP(DGMM, LOGL_ERROR, "%s(): Unexpected Rx %s\n", __func__, pdu_name);
 		OSMO_ASSERT(0);

