gprs_gmm: remove duplicated start of T3395

The timer is already scheduled by gsm48_tx_gsm_deact_pdp_req().

Change-Id: I8203b939d2196f87b11c0f3b2b0ff481e572835c
diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index 80f653a..b4bbfed 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -2084,8 +2084,7 @@
 			sgsn_delete_pdp_ctx(pdp);
 			break;
 		}
-		gsm48_tx_gsm_deact_pdp_req(pdp, GSM_CAUSE_NET_FAIL); 
-		osmo_timer_schedule(&pdp->timer, sgsn->cfg.timers.T3395, 0);
+		gsm48_tx_gsm_deact_pdp_req(pdp, GSM_CAUSE_NET_FAIL);
 		break;
 	default:
 		LOGPDPCTXP(LOGL_ERROR, pdp, "timer expired in unknown mode %u\n",