mInternalEmulated could be used after shutdown() called

It fixes the findvolume() / reset() use-after-free issue after
shutdown called to avoid vold crash.

bug: 64833901
Test: test reboot
Fixes: a5bbb5e3c13d ("make shutdown safe for double calls.")
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>

(cherry picked from commit d263da88076f5299e6202f8b388eab79f6fdd495)

Change-Id: I636b28f30fb82e4672d88144cd04072d24ef3b85
1 file changed