clean up GCC 6.3 workaround

This is all kind of silly... this is just a little bit of code that's
not really reachable, but there to satisfy compilers that can't figure
that out.

Change-Id: Ib39e8bf0fd26e28541cfad37c7ea135a30dbe85a
Reviewed-on: https://skia-review.googlesource.com/21365
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2 files changed