ns2: Increment Rx and Tx byte / packet counters

Change-Id: If5e93f69cddbc8962cbbae38c07b504dd9b1ecd1
diff --git a/src/gb/gprs_ns2_message.c b/src/gb/gprs_ns2_message.c
index d97c2a5..cd49896 100644
--- a/src/gb/gprs_ns2_message.c
+++ b/src/gb/gprs_ns2_message.c
@@ -168,6 +168,9 @@
 
 static int ns_vc_tx(struct gprs_ns2_vc *nsvc, struct msgb *msg)
 {
+	rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_OUT]);
+	rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_OUT], msgb_length(msg));
+
 	return nsvc->bind->send_vc(nsvc, msg);
 }