pre-upload: fix repo-name layout.conf check

The code assumed data was one large string buffer rather than an array
of lines.  Fix the check to work with an array.

BUG=chromium:386495
TEST=checked moblab overlay CL

Change-Id: I1f9cf18cc7f9319108dec561952db8ac7f843165
Reviewed-on: https://chromium-review.googlesource.com/219286
Reviewed-by: Steve Fung <stevefung@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed