Fix "warning: cast from pointer to integer of different size"

[Dmitry Timoshkov]

"Erik de Castro Lopo" <mle+win at mega-nerd.com> wrote:

>> > /* get pointer to object containing list element */
>> > #define LIST_ENTRY(elem, type, field) \
>> > -    ((type *)((char *)(elem) - (unsigned int)(&((type *)0)->field)))
>> > +    ((type *)((char *)(elem) - (unsigned long)(&((type *)0)->field)))
>> 
>> It should be replaced with FIELD_OFFSET instead.
> 
> FIELD_OFFSET is defined in include/winnt.h. 
> 
> Now I could include winnt.h into include/wine/list.h but that doesn't
> seem right. I could also copy it,but having two difinitions of the
> same macro is also not right. I'm also sure that moving the definition
> from include/winnt.h to include/wine/list.h will break existing code.
> 
> Any suggestions for dealing with this?

Replacing (unsigned int) cast by (unsigned long) doesn't guarantee
anything, long can be a 32-bit entity on a 64-bit platform.

-- 
Dmitry.