[SCSI] sr: split sr_audio_ioctl into specific helpers
split each ioctl handled in sr_audio_ioctl into a function of it's own. This cleans the code up nicely, and allows various places in sr_ioctl to call these helpers directly instead of going through the multiplexer. Signed-off-by: NChristoph Hellwig <hch@lst.de> Acked-by: NJens Axboe <axboe@suse.de> Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
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