Potential metafile NULL pointer dereference

[Chris]

Hello.

Curious as to how the (now patched) .wmf exploit happens, I went looking 
through Wine's source to follow the code path. In doing so, I found a couple 
points where there could be a potential NULL pointer dereference, which I 
submitted a bug report for:
http://bugs.winehq.org/show_bug.cgi?id=4298
On the advice of the first reply, I'm also sending the patch here.
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