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The original code touches out of bounds of the source buffer.
This CL fixes the issue.

Bug: b:155054799
Test: video_decode_accelerator_tests on hatch
Change-Id: I03067fe2231a55dd2edb2963525a03f1667d694a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2409725Reviewed-by: Miguel Casas <mcasas@chromium.org>
Auto-Submit: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808229}