cbsp.c: Remove dead code

Change-Id: I0888fbad0f9094ec1b31e2cceecfc9cd372399bd
Closes: CID#202057
diff --git a/src/gsm/cbsp.c b/src/gsm/cbsp.c
index 23f68de..84b9235 100644
--- a/src/gsm/cbsp.c
+++ b/src/gsm/cbsp.c
@@ -1391,10 +1391,8 @@
 
 	if (!msg) {
 		msg = osmo_cbsp_msgb_alloc(ctx, __func__);
-		if (!msg) {
+		if (!msg)
 			return -ENOMEM;
-			goto discard_msg;
-		}
 		msg->l1h = msg->tail;
 	}