x86/crossystem_arch: Free file descriptor if we fail to use it

Found by Coverity Scan #204275

BUG=none
BRANCH=none
TEST=Coverity run after this merged marks #204275 fixed

Change-Id: I50e6300eabaf6bd0c1230b0cbd2d375ab1daf5d2
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1827293
Reviewed-by: Duncan Laurie <dlaurie@google.com>
Commit-Queue: Patrick Georgi <pgeorgi@chromium.org>
Tested-by: Patrick Georgi <pgeorgi@chromium.org>
1 file changed