xup: Display mismatched version number to user

The mismatched versions are now displayed to the user rathe than being
buried in the log. This should aid fault reporting and help users find
distro-introduced problems with an Internet search.

xup/xup.c

@@ -1836,12 +1836,12 @@ lib_mod_process_message(struct mod *mod, struct stream *s)
                     in_uint32_le(s, version);
                     if (version != CLIENT_INFO_CURRENT_VERSION)
                     {
-                        LOG(LOG_LEVEL_ERROR,
-                            "Xorg module has version %d, expected %d",
-                            version, CLIENT_INFO_CURRENT_VERSION);
-                        mod->server_msg(mod,
-                                        "Xorg module has wrong version number",
-                                        0);
+                        char msg[128];
+                        g_snprintf(msg, sizeof(msg),
+                                   "Xorg module has version %d, expected %d",
+                                   version, CLIENT_INFO_CURRENT_VERSION);
+                        LOG(LOG_LEVEL_ERROR, "%s", msg);
+                        mod->server_msg(mod, msg, 0);
                         mod->caps_processing_status = E_CAPS_NOT_OK;
                     }
                     break;