i965: Increase Sandybridge point size clamp in the clip state.

255.875 matches the hardware documentation.  Presumably this was a typo.

NOTE: This is a candidate for the 7.10 branch, along with
      commit 2bfc23fb86964e4153f57f2a56248760f6066033.

Reviewed-by: Eric Anholt <eric@anholt.net>
1 file changed