The fixture->fd is created in fixture_setup() and, likewise, needs to be closed
in fixture_tear_down().

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Alex Chen <alex.chen@huawei.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20201125102403.57709-1-alex.chen@huawei.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>