[PATCH 3/3] dix: allow for button-only input devices (#21457)

[Chase Douglas]

On 12/07/2010 08:58 PM, Peter Hutterer wrote:
> Add a few checks for the existence of a valuator class on the device to
> avoid null-pointer dereferences for button events from devices without a
> valuator class.
> 
> X.Org Bug 21457 <http://bugs.freedesktop.org/show_bug.cgi?id=21457>
> 
> Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
Reviewed-by: Chase Douglas <chase.douglas at canonical.com>