skd: Remove a redundant init_timer() call

Since setup_timer() invokes init_timer(), invoking init_timer()
just before setup_timer() is redundant. Hence remove the init_timer()
call.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>