Fix M:initial_state/0 handling
Fix M:initial_state/0 handling

initial_state/0 may return {'foo_state', Data} or 'foo_state'.  Adjust
the caller accordingly.

Cloven/triq,jstepien/triq,hlieberman/triq,tuncer/triq,linearregression/triq,zkessin/triq,open-triq/triq,krestenkrab/triq,edholland/triq