comctl32: fix Itemtext in treeview.c (Bug #16466)

[Austin English]

On Sun, Jan 11, 2009 at 10:03 AM, Nerv <nerv at dawncrow.de> wrote:
> This fixes TREEVIEW_DoSetItemT if tvItem->pszText=0
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Please use your full real name on patches.

A testcase would help.

-- 
-Austin