chromeos: Ensure that the last file in FW_MAIN is not also the first one

In the case where one of the FW_MAIN regions is empty, the last file
(empty) will also appear to be first and have a zero offset, making head
complain.

This is a very borderline use case, since the FW_MAIN_ regions should
have been filled previously, but an extra check doesn't hurt.

Change-Id: I15491c5b4a5e7d1f9fb369cc5fa4e3875e2dad3b
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: https://review.coreboot.org/14472
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

0 files changed, 0 insertions, 0 deletions