tslib.c: use our own ts_error_fn to print to syslog too

Author: merge

src/tslib.c

@@ -88,6 +88,13 @@ struct ts_priv {
 #endif
 };
 
+static int errfn(const char *fmt, va_list ap)
+{
+	xf86ErrorF(fmt, ap);
+
+        return vfprintf(stderr, fmt, ap);
+}
+
 static void ReadInputLegacy(InputInfoPtr local)
 {
 	struct ts_priv *priv = (struct ts_priv *) (local->private);
@@ -416,6 +423,8 @@ static int xf86TslibInit(__attribute__ ((unused)) InputDriverPtr drv,
 
 	pInfo->fd = ts_fd(priv->ts);
 
+	ts_error_fn = errfn;
+
 	/* process generic options */
 	xf86CollectInputOptions(pInfo, NULL);
 	xf86ProcessCommonOptions(pInfo, pInfo->options);