gamma_dma_priority and gamma_dma_send_buffers both deref d->send_indices

    and/or d->send_sizes. When these functions are called from gamma_dma,
    these pointers are user pointers and are thus not safe to deref. This
    patch copies over the pointers inside gamma_dma_priority and
    gamma_dma_send_buffers.
Submitted-by: Robert T. Johnson <rtjohnso@eecs.berkeley.edu> Signed-off-by:
    Dave Airlie <airlied@linux.ie>