Fix mmap error test

mmap returns -1 (MMAP_FAILED) when it fails, not 0.
Also fix indentation while we're at it.

BUG=none
TEST=on ryu, we don't crash (instead we fail cleanly)

Change-Id: I90a5bc575dd9ced7b803d16798d2587920e2106e
Reviewed-on: https://chromium-review.googlesource.com/236984
Tested-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-by: David Sodman <dsodman@chromium.org>
Commit-Queue: Stéphane Marchesin <marcheu@chromium.org>
1 file changed