vme: make remove callback return void

vme: make remove callback return void

The driver core ignores the return value of struct bus_type::remove()
because there is only little that can be done. To simplify the quest to
make this function return void, let struct vme_driver::remove return void,
too. There is only a single vme driver and it already returns 0
unconditionally in .remove().

Also fix the bus remove function to always return 0.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20210127212329.98517-1-uwe@kleine-koenig.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>