mpr: fix a compiler error on PowerPC

[Steven Edwards]

---------- Forwarded message ----------
From: art yerkes <art.yerkes(a)gmail.com>
Date: 2009/1/9
Subject: Re: mpr: fix a compiler error on PowerPC
To: Steven Edwards <winehacker(a)gmail.com>
According to Art Yerkes who has a copy of PPC VC++

"Here's what I get.  The first test (char) works identically to the
second test (signed char), so the default has to be signed."


-- 
Steven Edwards

"There is one thing stronger than all the armies in the world, and
that is an idea whose time has come." - Victor Hugo