skd: Make it easier for static analyzers to analyze skd_free_disk()
Although it is easy to see that skdev->disk != NULL if skdev->queue != NULL, add a test for skdev->disk to avoid that smatch reports the following warning: drivers/block/skd_main.c:3080 skd_free_disk() error: we previously assumed 'disk' could be null (see line 3074) Reported-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NBart Van Assche <bart.vanassche@wdc.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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