test: cleanup: firmware::close() tests
test: cleanup: firmware::close() tests

Signed-off-by: Patrick Venture <36c53fa43f47f3fd67cb2fc38031827244d18a1f@google.com>
Change-Id: Ic6e216e48fe7b958b65dba24947e4fdbeb36be69

openbmc/phosphor-ipmi-flash