iris: remove useless bo->gtt_offset assignment

We assign a real value a few lines below, and none of the lines in
between rely on the zeroed bo->gtt_offset value.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4561>
1 file changed