r600g: sampler and texture state doesn't need a range/block.

r600g: sampler and texture state doesn't need a range/block.

These are handled separately in the winsys, so don't need the calculations
done at this point. this manifested as a crash in point-sprite,

Thanks to XoD on #radeon for pointing it out.

Signed-off-by: Dave Airlie <airlied@redhat.com>