[PATCH] graph: fix head move when graph walk in mcore dispatch

[Wu, Jingjing]

> >  		/* skip the src nodes which not bind with current worker */
> >  		if ((int32_t)head < 0 && node->dispatch.lcore_id != graph-
> > >dispatch.lcore_id)
> >  			continue;
> > -
> > +		head++;
> If current src node not bind with current core, It will go into infinite loop.
> This line would have no chance to run.

Seems reasonable, it might be OK to change "head<0" to "head <1" the condition check?