sgi-gru: grukservices: remove unnecessary (void*) conversions

void * pointer cb, no cast type assignment required.

Signed-off-by: Li kunyu <kunyu@nfschina.com>
Link: https://lore.kernel.org/r/20221216055910.3559-1-kunyu@nfschina.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>