bts: extend bts_chan_load to allow counting tch only

Change-Id: I86f1d502649747b6b9aefcb39081b14110e8f494
diff --git a/openbsc/src/libbsc/bsc_vty.c b/openbsc/src/libbsc/bsc_vty.c
index 5c95e85..01eec23 100644
--- a/openbsc/src/libbsc/bsc_vty.c
+++ b/openbsc/src/libbsc/bsc_vty.c
@@ -329,7 +329,7 @@
 
 	/* FIXME: chan_desc */
 	memset(&pl, 0, sizeof(pl));
-	bts_chan_load(&pl, bts);
+	bts_chan_load(&pl, bts, 0);
 	vty_out(vty, "  Current Channel Load:%s", VTY_NEWLINE);
 	dump_pchan_load_vty(vty, "    ", &pl);
 }