scsi: sg: sg_write(): get rid of access_ok()/__copy_from_user()/__get_user()

Just use plain copy_from_user() and get_user().  Note that while a
buf-derived pointer gets stored into ->dxferp, all places that actually use
the resulting value feed it either to import_iovec() or to
import_single_range(), and both will do validation.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Al Viro <[email protected]>
Acked-by: Douglas Gilbert <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

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