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Fix a memory leak in the error handling path of function sg_io()
that is used during the processing of scsi ioctl. Memory already
allocated by rw_copy_check_uvector() needs to be freed correctly.
Detected by Coverity: CID 1128953.
Signed-off-by: Christian Engelmayer <cengelma@gmx.at>
Signed-off-by: Jens Axboe <axboe@kernel.dk>