Fix potential uninitialed read

Fix potential uninitialed read

BUG=none
Test=can compile crosvm
Change-Id: I65577ca08f4d41ff6a7b6d2a2af42f82798608bf
Tested-by: ghartman@google.com
Reviewed-by: adelva@google.com
Reviewed-on: https://android-review.googlesource.com/c/platform/external/minigbm/+/1056177
Reviewed-on: https://chromium-review.googlesource.com/1707385
Tested-by: Greg Hartman <ghartman@google.com>
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>