util/kconfig: Allow toada to handle negative integers

Any builds using ADA were getting a message saying:
`couldn't parse value '-1' for 'SEABIOS_DEBUG_LEVEL'`

This change allows toada to parse negative integers.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I6507c54976b67f1ad70846b6bd6c54c861130d3d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77421
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>

0 files changed, 0 insertions, 0 deletions