bssmap_handle_assignm_req(): Don't print log statemens in malloc failure case

Change-Id: I85528689b5298a13c60ae80fabd8d66459f730a9
diff --git a/src/osmo-bsc/osmo_bsc_bssap.c b/src/osmo-bsc/osmo_bsc_bssap.c
index 3e15248..156ebd3 100644
--- a/src/osmo-bsc/osmo_bsc_bssap.c
+++ b/src/osmo-bsc/osmo_bsc_bssap.c
@@ -889,10 +889,7 @@
 
 reject:
 	resp = gsm0808_create_assignment_failure(cause, NULL);
-	if (!resp) {
-		LOGP(DMSC, LOGL_ERROR, "Channel allocation failure.\n");
-		return -1;
-	}
+	OSMO_ASSERT(resp);
 
 	osmo_bsc_sigtran_send(conn, resp);
 	return -1;