- on a very specific scenario when the next buffer to allocate was
fitting exactly in the allocated size. The condition was wrong and
needed to be >= instead of >.

Bug: angleproject:2562
Change-Id: Ide36bc3baadafdc1ffa40416b46998dc455caecf
Reviewed-on: https://chromium-review.googlesource.com/1075293
Commit-Queue: Luc Ferron <lucferron@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>