fsm: talloc + copy the 'id' passed into a FSM

The 'id' is used to generate the human-readable name of the FSM.
However, when the FSM creates slave FSMs later, the caller-passed "ID"
mgiht long be gone again (e.g. it was on stack memory).  So let's copy
the 'id' string to a chunk of dynamically-allocated memory at time of
FSM start to ensure we have it later when creating child FSMs.

Change-Id: Ib88a2c02c5c91f17b4ec1e9db57a06d6d66465fb
1 file changed