msxml3: Don't free namespace data tracked in a tree

[Nikolay Sivov]

Fixes regression from ea9a6a4b4e33cc8f56bc7835f7f05146487fb5d2.

Looking at libxml2 code, I shouldn't free returned pointer, cause even 
if namespace isn't created already in tree, it will be created and 
linked to a node. So data is freed when a node is freed.

Fixes a crash here http://bugs.winehq.org/show_bug.cgi?id=17188

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