[alloc] Assign a TCH for LU when all SDCCHs are occupied.

When the cell becomes visible we will be bombed with location
updating requests and to reduce the load on the network we should
assign as many channels for it as possible. During load peek it
is even more important than to have a spare voice channel and in
general the LU procedure is pretty fast.
diff --git a/openbsc/src/handover_logic.c b/openbsc/src/handover_logic.c
index 92580bf..30cea7b 100644
--- a/openbsc/src/handover_logic.c
+++ b/openbsc/src/handover_logic.c
@@ -104,7 +104,7 @@
 		return -ENOSPC;
 	}
 
-	new_lchan = lchan_alloc(bts, old_lchan->type);
+	new_lchan = lchan_alloc(bts, old_lchan->type, 0);
 	if (!new_lchan) {
 		LOGP(DHO, LOGL_NOTICE, "No free channel\n");
 		counter_inc(bts->network->stats.handover.no_channel);