Clean up after SIGHUP

Cleanly terminate and clean up after ourselves when we receive
SIGHUP, e.g. when our terminal goes away.

Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Change-Id: I3788a78dd68836e96d91f6c3dccefd4d070aeb05
Reviewed-on: https://review.coreboot.org/c/em100/+/51346
Reviewed-by: ron minnich <rminnich@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed