rspro_server: Fix log output in client_conn_send()

Change-Id: I4b089011dcdc261837d1d9a7dc184568027f6df0
diff --git a/src/server/rspro_server.c b/src/server/rspro_server.c
index 5717ff0..9bf3a19 100644
--- a/src/server/rspro_server.c
+++ b/src/server/rspro_server.c
@@ -49,7 +49,7 @@
 		ASN_STRUCT_FREE(asn_DEF_RsproPDU, pdu);
 		return;
 	}
-	LOGPFSM(conn->fi, "Tx RSPRO %s\n", pdu);
+	LOGPFSM(conn->fi, "Tx RSPRO %s\n", rspro_msgt_name(pdu));
 	ipa_prepend_header_ext(msg_tx, IPAC_PROTO_EXT_RSPRO);
 	ipa_msg_push_header(msg_tx, IPAC_PROTO_OSMO);
 	ipa_server_conn_send(conn->peer, msg_tx);