mesa: fix unpack_Z32_FLOAT_X24S8() / unpack_Z32_FLOAT() mix-up

And use the z32f_x24s8 helper struct in unpack_Z32_FLOAT_X24S8().
Cc: "10.0" "10.1" <mesa-stable@lists.freedesktop.org>

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
1 file changed