test: remove a bunch of superfluous empty lines

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Replace hardcoded 0 with the enum for it

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
tools: add a tool to print the actual range provided by a touchpad

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Document that the return value of get_name|uniq|phys is not permanent

It's a pointer to the copy libevdev has, but that copy may be freed by the
caller if someone calls e.g. libevdev_set_name()

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