This fixes a race condition crash in homed that would happen in the
following sequence of events:
1. Client 1 takes a ref on the home area
2. Client 1 calls some method via dbus
3. Client 2 calls Release()
In homed, the Release() would check if a ref is still held (in this
case: yes it is) and returns an error. Except that is done through a
code-path that asserts that no operations are ongoing. In this case,
it's valid to have an ongoing operation, and so the assertion fails
causing homed to crash.
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