RE: fix typo in reorderbuffer.c

[Hou, Zhijie]

> I found a possible typo in reorderbuffer.c
> 
>  *   has got a combocid. Combocid's are only valid for the duration
> of a
> 
> Combocid's ==>> Combocids
> 
> Attatching a small patch to correct it.
> 

Ping again, just in case it’s missed.