move statistics counter rlc_sent() to gprs_rlcmac_sched

The counter rlc_sent has nothing to do with the TBF.
The RLC packet got sent in the gprs_rlcmac_sched().

Change-Id: I5d2b910ea7cc250f17530406eda3be9b29b051fd
Reviewed-on: https://gerrit.osmocom.org/84
Tested-by: Jenkins Builder
Reviewed-by: Holger Freyther <holger@freyther.de>
diff --git a/src/gprs_rlcmac_sched.cpp b/src/gprs_rlcmac_sched.cpp
index 313e23f..8e05623 100644
--- a/src/gprs_rlcmac_sched.cpp
+++ b/src/gprs_rlcmac_sched.cpp
@@ -341,8 +341,11 @@
 		dl_ass_tbf, ul_ack_tbf);
 
 	/* Prio 2: select data message for downlink */
-	if (!msg)
+	if (!msg) {
 		msg = sched_select_downlink(bts, trx, ts, fn, block_nr, pdch);
+		if (msg)
+			bts->bts->rlc_sent();
+	}
 
 	/* Prio 3: send dummy contol message */
 	if (!msg)