cosmetic: Use msgb_hexdump*() rather than manual osmo_hexdump() on msg

This requires libosmocore Change-Id I98e85397fb541ee0fd711f2e1852f63f3bb87359

Change-Id: Ieeb97a9f1eba2fdef84294b8c8c7ac0984ae5c70
diff --git a/src/libmsc/gsm_04_11.c b/src/libmsc/gsm_04_11.c
index 62c2902..45b56d2 100644
--- a/src/libmsc/gsm_04_11.c
+++ b/src/libmsc/gsm_04_11.c
@@ -122,7 +122,7 @@
 
 static int gsm411_sendmsg(struct gsm_subscriber_connection *conn, struct msgb *msg)
 {
-	DEBUGP(DLSMS, "GSM4.11 TX %s\n", osmo_hexdump(msg->data, msg->len));
+	DEBUGP(DLSMS, "GSM4.11 TX %s\n", msgb_hexdump(msg));
 	msg->l3h = msg->data;
 	return msc_tx_dtap(conn, msg);
 }