Fix a possible OOB read in InsertD3D11FormatInfo. It's unclear how this might happen, as it's during static map init, but add a fail-safe to be sure. BUG=526779 Change-Id: I5aa33f9bed30d4a8c1e9937a0b8c5fd11a7503d7 Reviewed-on: https://chromium-review.googlesource.com/302385 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tryjob-Request: Jamie Madill <jmadill@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>