abis: Use LOGL_ERROR for the Failure Event Report

It is not an error of the BSC but we will treat a
BTS error like an error of the BSC for now.
diff --git a/openbsc/src/libbsc/abis_nm.c b/openbsc/src/libbsc/abis_nm.c
index 4f29dd9..0007816 100644
--- a/openbsc/src/libbsc/abis_nm.c
+++ b/openbsc/src/libbsc/abis_nm.c
@@ -786,28 +786,28 @@
 	const uint8_t *p_val;
 	char *p_text;
 
-	DEBUGPC(DNM, "Failure Event Report ");
+	LOGPC(DNM, LOGL_ERROR, "Failure Event Report ");
 	
 	abis_nm_tlv_parse(&tp, mb->trx->bts, foh->data, oh->length-sizeof(*foh));
 
 	if (TLVP_PRESENT(&tp, NM_ATT_EVENT_TYPE))
-		DEBUGPC(DNM, "Type=%s ", event_type_name(*TLVP_VAL(&tp, NM_ATT_EVENT_TYPE)));
+		LOGPC(DNM, LOGL_ERROR, "Type=%s ", event_type_name(*TLVP_VAL(&tp, NM_ATT_EVENT_TYPE)));
 	if (TLVP_PRESENT(&tp, NM_ATT_SEVERITY))
-		DEBUGPC(DNM, "Severity=%s ", severity_name(*TLVP_VAL(&tp, NM_ATT_SEVERITY)));
+		LOGPC(DNM, LOGL_ERROR, "Severity=%s ", severity_name(*TLVP_VAL(&tp, NM_ATT_SEVERITY)));
 	if (TLVP_PRESENT(&tp, NM_ATT_PROB_CAUSE)) {
 		p_val = TLVP_VAL(&tp, NM_ATT_PROB_CAUSE);
-		DEBUGPC(DNM, "Probable cause= %02X %02X %02X ", p_val[0], p_val[1], p_val[2]);
+		LOGPC(DNM, LOGL_ERROR, "Probable cause= %02X %02X %02X ", p_val[0], p_val[1], p_val[2]);
 	}
 	if (TLVP_PRESENT(&tp, NM_ATT_ADD_TEXT)) {
 		p_val = TLVP_VAL(&tp, NM_ATT_ADD_TEXT);
 		p_text = talloc_strndup(tall_bsc_ctx, (const char *) p_val, TLVP_LEN(&tp, NM_ATT_ADD_TEXT));
 		if (p_text) {
-			DEBUGPC(DNM, "Additional Text=%s ", p_text);
+			LOGPC(DNM, LOGL_ERROR, "Additional Text=%s ", p_text);
 			talloc_free(p_text);
 		}
 	}
 
-	DEBUGPC(DNM, "\n");
+	LOGPC(DNM, LOGL_ERROR, "\n");
 
 	return 0;
 }