CHROMIUM: tegra/gk20a: check cur_chunk instead sgt

gk20a_mm_iova_addr attempts to deference the current sg list,
so check that instead.

BUG=chromium:980499
TEST=no kernel panic when enabling assistant

Change-Id: I8283979a9c5b6b9e44d28a17f9bcf1470cd27d3a
Reviewed-on: https://chromium-review.googlesource.com/1716238
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Ready: Douglas Anderson <dianders@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Robert Tarasov <tutankhamen@chromium.org>
1 file changed