[PATCH] Add a missing NULL check for device->grab.

[Dima Ryazanov]

>
> I don't know how you generated the patch but it didn't apply okay for me. I
> guess due the following line wrap that happened for some reason (your email
> client?):
>
>    > +               device->grab->interface->button(device->grab, time,
> button,
>    > state);
>
> Have you used git format-patch for it?
>
>
Whoops. I did use "format-patch", but then I just pasted the output into
Gmail. I'll try using "send-email" now.
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