amdfwtool: Fix the gcc warning about sign comparison

New (maybe) compile tool complains the warning below.
warning: comparison between signed and unsigned
integer expressions [-Wsign-compare]
Fix all of them.

Change-Id: I59624326233284e6c3595df49625563254949c45
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45893
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

0 files changed, 0 insertions, 0 deletions