server: Fix for possible desktop variable being NULL when set_process_default_desktop is called

[Robert Shearman]

Alexandre Julliard wrote:

>Robert Shearman <rob at codeweavers.com> writes:
>
>  
>
>>Handle is non-NULL here.
>>
>>    
>>
>>>   *if* ((handle = find_inherited_handle( process, &desktop_ops )))
>>>      
>>>
>
>It's set to NULL here if we don't find an inherited handle.
>  
>

    /* check for an inherited winstation handle (don't ask...) */
    if ((handle = find_inherited_handle( process, &winstation_ops )))
    {
        winstation = (struct winstation *)get_handle_obj( process, 
handle, 0, &winstation_ops );
    }
    else if (parent && parent->process->winstation)
    {
        handle = duplicate_handle( parent->process, 
parent->process->winstation,
                                   process, 0, 0, DUP_HANDLE_SAME_ACCESS );
        winstation = (struct winstation *)get_handle_obj( process, 
handle, 0, &winstation_ops );
    }
    if (!winstation) goto done;
    process->winstation = handle;

Handle is guaranteed to be non-NULL here, since winstation and handle 
are the same object (well, except if duplicate_handle fails).

-- 
Rob Shearman