bsc: lchan_fsm: Add missing transition WAIT_TS_READY->WAIT_RLL_RTP_RELEASED

20181128193707326 DCHAN osmo-bsc/lchan_rtp_fsm.c:193 lchan_rtp(0-0-6-TCH_F_PDCH-0)[0x612000002320]{WAIT_MGW_ENDPOINT_AVAILABLE}: Freeing instance
20181128193707327 DCHAN fsm.c:381 lchan_rtp(0-0-6-TCH_F_PDCH-0)[0x612000002320]{WAIT_MGW_ENDPOINT_AVAILABLE}: Deallocated
20181128193707327 DCHAN osmo-bsc/lchan_rtp_fsm.c:193 lchan(0-0-6-TCH_F_PDCH-0)[0x6120000039a0]{WAIT_TS_READY}: Received Event LCHAN_EV_RTP_RELEASED
20181128193707330 DCHAN osmo-bsc/lchan_fsm.c:1347 lchan(0-0-6-TCH_F_PDCH-0)[0x6120000039a0]{WAIT_TS_READY}: transition to state WAIT_RLL_RTP_RELEASED not permitted!

Change-Id: I43aab5ed8ac369869b191b3b7c938ce4985ab849
diff --git a/src/osmo-bsc/lchan_fsm.c b/src/osmo-bsc/lchan_fsm.c
index 742836c..6b632d6 100644
--- a/src/osmo-bsc/lchan_fsm.c
+++ b/src/osmo-bsc/lchan_fsm.c
@@ -1131,6 +1131,7 @@
 		.out_state_mask = 0
 			| S(LCHAN_ST_UNUSED)
 			| S(LCHAN_ST_WAIT_ACTIV_ACK)
+			| S(LCHAN_ST_WAIT_RLL_RTP_RELEASED)
 			,
 	},
 	[LCHAN_ST_WAIT_ACTIV_ACK] = {