Fixes code duplication, return of function.
Check client->irq properly when setting up optional irq handler.
Signed-off-by: NGwendal Grignou <gwendal@chromium.org>
Reviewed-by: NHartmut Knaack <knaack.h@gmx.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>