dyn TS: debug log 'switchover complete' only when there was a switchover

Change-Id: I7ddcb41edce1cd7b22fe91e33bdcaedb21856222
diff --git a/openbsc/src/libbsc/abis_rsl.c b/openbsc/src/libbsc/abis_rsl.c
index 3cf1b25..0acff21 100644
--- a/openbsc/src/libbsc/abis_rsl.c
+++ b/openbsc/src/libbsc/abis_rsl.c
@@ -2538,8 +2538,9 @@
 	pchan_was = ts->dyn.pchan_is;
 	ts->dyn.pchan_is = ts->dyn.pchan_want = pchan_act;
 
-	LOGP(DRSL, LOGL_INFO, "%s switchover from %s complete.\n",
-	     gsm_ts_and_pchan_name(ts), gsm_pchan_name(pchan_was));
+	if (pchan_was != ts->dyn.pchan_is)
+		LOGP(DRSL, LOGL_INFO, "%s switchover from %s complete.\n",
+		     gsm_ts_and_pchan_name(ts), gsm_pchan_name(pchan_was));
 }
 
 /* Entry-point where L2 RSL from BTS enters */