src: run make format on all files

Apparently we forgot to run `make format` on a few commits lately. This
commit was just a `make format` run to fix some nits. clang-format
version: `clang-format version 5.0.1 (tags/RELEASE_501/final)`

PR-URL: nodejs#229
Reviewed-By: Colin Ihrig <[email protected]>

Author: mmarchini