d1bbf6b681
Avoid crashing U-Boot when the GPIO controller for a button is disabled
or failed to probe. We also need to check the priv data for each button
since even if a button fails to probe it will still be polled by the
core code.
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
(cherry picked from commit 15299fa5dd)