Check that tx is not null before accessing it, similar to the previous
if statements.
Change-Id: I820cb670026bb12a54c63227aa04e778fd49c66a
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: Coverity CID 1294805
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34530
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
bd00fb1366