ole32: change a pointer cast from DWORD to DWORD_PTR

[Austin English]

-- 
-Austin
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diff --git a/dlls/ole32/compobj.c b/dlls/ole32/compobj.c
index b8ddba8..7360f66 100644
--- a/dlls/ole32/compobj.c
+++ b/dlls/ole32/compobj.c
@@ -2007,7 +2007,7 @@ HRESULT WINAPI CoRegisterClassObject(
    * Use the address of the chain node as the cookie since we are sure it's
    * unique. FIXME: not on 64-bit platforms.
    */
-  newClass->dwCookie        = (DWORD)newClass;
+  newClass->dwCookie        = (DWORD_PTR)newClass;
 
   /*
    * Since we're making a copy of the object pointer, we have to increase its