util/mb/google/hatch: fix style issues in shell script

* Use all caps for variables.
* Use a single exit code for failures.
* No need to popd before exiting the script.
* Do ${var,,} and ${var^^} into variables instead of using it everywhere.
* Add more punctuation in comments.
* Specify LC_ALL=C so that upper/lower case show the desired behavior.

Signed-off-by: Paul Fagerburg <pfagerburg@chromium.org>
Change-Id: I63aa0aa633f36b9543e809fc42fac955da5960a3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35605
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Andrew McRae <amcrae@chromium.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>

0 files changed, 0 insertions, 0 deletions