Code was aliasing mBuffer as buffer, but continuing to use both buffer
and mBuffer after that point. This was at best misleading, and at worst
could confuse the compiler into generating bad code. There was no
performance advantage to the alias, in fact removing it saves 16 bytes.
Change-Id: I55023ddba465d9be82f66745b088d18af658ac60
d8b2e2b9e3