Fix BufferStorage11::getLatestStorage not finding the latest buffer. If there are only buffers with data revision 0, getLatestStorage will skip over them. Fixed the if statement so that it will always find a buffer if one exists. BUG=angle:644 Change-Id: I24fc426383c9ae18b7ccf2f8937a9daa7a071ebe Reviewed-on: https://chromium-review.googlesource.com/198826 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>