Fix status error to avoid releasing component twice

When flush action is stuck, component will be released,
and state will be changed to RELEASED.
Then flush completed or returned error, and state will be
changed to FLUSHED.
When shutdown, release is called again, and exception happens.

Solution: Change state to FLUSHED only when it is FLUSHING

Bug: 136790747
Test: It is a seldom issue, and only happens when flush action
is stuck. We test this patch by modifying code to make flush
time more than 3s.
Change-Id: I74cb2599a9e029332d600469f38630651d9f43c0