tile: enable sparse checks for get/put_user

Add an extra intermediate variable to __get_user and __put_user
to give sparse an opportunity to detect mismatches.

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>

diff --cc arch/tile/include/asm/uaccess.h
Simple merge