st/readpixels: fix accel path for skipimages.
We don't need to use the 3d image address here as that will include SKIP_IMAGES, and we are only blitting a single 2D anyways, so just use the 2D path. This fixes some memory overruns under CTS packed_pixels.packed_pixels_pixelstore when PACK_SKIP_IMAGES is used. Cc: "11.0" <mesa-stable@lists.freedesktop.org> Reviewed-by:Iago Toral Quiroga <itoral@igalia.com> Signed-off-by:
Dave Airlie <airlied@redhat.com> (cherry picked from commit 6a3e1fb9)