hnbap: log errors on decoding/encoding HNB-REGISTER msgs

Change-Id: I3c039267fa2cc047c5678bcfe4a603f70c21cdd1
diff --git a/src/hnbgw_hnbap.c b/src/hnbgw_hnbap.c
index 2746c21..8fba13c 100644
--- a/src/hnbgw_hnbap.c
+++ b/src/hnbgw_hnbap.c
@@ -63,6 +63,8 @@
 	memset(&accept_out, 0, sizeof(accept_out));
 	rc = hnbap_encode_hnbregisteraccepties(&accept_out,  &accept);
 	if (rc < 0) {
+		LOGP(DHNBAP, LOGL_ERROR, "Failure to encode HNB-REGISTER-ACCEPT to %s: rc=%d\n",
+		     ctx->identity_info, rc);
 		return rc;
 	}
 
@@ -370,8 +372,11 @@
 	int rc;
 
 	rc = hnbap_decode_hnbregisterrequesties(&ies, in);
-	if (rc < 0)
+	if (rc < 0) {
+		LOGP(DHNBAP, LOGL_ERROR, "Failure to decode HNB-REGISTER-REQ from %s: rc=%d\n",
+		     ctx->identity_info, rc);
 		return rc;
+	}
 
 	/* copy all identity parameters from the message to ctx */
 	asn1_strncpy(ctx->identity_info, &ies.hnB_Identity.hNB_Identity_Info,