The end_io_data member of the "struct request" type has type "void *", so
no cast is necessary.

Link: https://lore.kernel.org/r/20220928222241.131334-1-mklntf@gmail.comReviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Markus Fuchs <mklntf@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>