Remove duplocate trigger_callback logic
Remove duplocate trigger_callback logic

Fixes issue # 17

TRIGGER_CALLBACK() and the resulting Dispose() was already occuring
outside the conditional. When passing a callback to walker.next(), the
callback would be triggered twice.

duralog/node-sencillo,duralog/node-sencillo,duralog/node-sencillo,duralog/node-sencillo