touchpad: only log the touch state if we have something to log

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index 3e62a1c..12963eb 100644 (file)
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -1926,7 +1926,8 @@ tp_debug_touch_state(struct tp_dispatch *tp,
                        t->pressure,
                        tp_touch_active(tp, t) ? "" : "inactive");
        }
-       evdev_log_debug(device, "touch state: %s\n", buf);
+       if (buf[0] != '\0')
+               evdev_log_debug(device, "touch state: %s\n", buf);
 }
 
 static void