handover: Not finding a HO record on CHAN ACT NACK is not an error

... it might well a completely non-ho-related establishment
diff --git a/openbsc/src/libbsc/handover_logic.c b/openbsc/src/libbsc/handover_logic.c
index c469e7c..711c260 100644
--- a/openbsc/src/libbsc/handover_logic.c
+++ b/openbsc/src/libbsc/handover_logic.c
@@ -229,7 +229,7 @@
 
 	ho = bsc_ho_by_new_lchan(new_lchan);
 	if (!ho) {
-		LOGP(DHO, LOGL_ERROR, "unable to find HO record\n");
+		LOGP(DHO, LOGL_INFO, "ACT NACK: unable to find HO record\n");
 		return -ENODEV;
 	}