USER32: Fix a typo

[Felix Nawothnig]

This fixes the statistics in the "Shared Files" tab in eMule.

ChangeLog:
Fix a typo.
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Index: dlls/user/button.c
===================================================================
RCS file: /home/wine/wine/dlls/user/button.c,v
retrieving revision 1.7
diff -u -p -r1.7 button.c
--- dlls/user/button.c	24 May 2005 10:10:42 -0000	1.7
+++ dlls/user/button.c	10 Jul 2005 03:20:17 -0000
@@ -657,8 +657,8 @@ static UINT BUTTON_CalcLabelRect(HWND hw
 
       default:
       empty_rect:
-         r.right = r.left;
-         r.bottom = r.top;
+         rc->right = r.left;
+         rc->bottom = r.top;
          return (UINT)(LONG)-1;
    }