abis_nm: Log an error when the channel combination can not be set.
diff --git a/openbsc/src/libbsc/abis_nm.c b/openbsc/src/libbsc/abis_nm.c
index 23d5fa3..a6a20e0 100644
--- a/openbsc/src/libbsc/abis_nm.c
+++ b/openbsc/src/libbsc/abis_nm.c
@@ -1575,7 +1575,7 @@
 	DEBUGP(DNM, "Set Chan Attr %s\n", gsm_ts_name(ts));
 	if (verify_chan_comb(ts, chan_comb) < 0) {
 		msgb_free(msg);
-		DEBUGP(DNM, "Invalid Channel Combination!!!\n");
+		LOGP(DNM, LOGL_ERROR, "Invalid Channel Combination!!!\n");
 		return -EINVAL;
 	}
 	ts->nm_chan_comb = chan_comb;