[autotest] Allow spaces in directory names.

`find | xargs` would choke on directories whose names contained spaces.
`find -print0 | xargx --null` is the way to fix this.

BUG=None
TEST=Ran it

Change-Id: Ib2d04a22196277e9da92ebe1a6d9c1ae2516f894
Reviewed-on: https://gerrit.chromium.org/gerrit/43216
Tested-by: Alex Miller <milleral@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
Commit-Queue: Alex Miller <milleral@chromium.org>
1 file changed