powerpc/ps3: make system bus's remove and shutdown callbacks return void

The driver core ignores the return value of struct device_driver::remove
because there is only little that can be done. For the shutdown callback
it's ps3_system_bus_shutdown() which ignores the return value.

To simplify the quest to make struct device_driver::remove return void,
let struct ps3_system_bus_driver::remove return void, too. All users
already unconditionally return 0, this commit makes it obvious that
returning an error code is a bad idea and ensures future users behave
accordingly.

Signed-off-by: Uwe Kleine-König <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Acked-by: Takashi Iwai <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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