comctl32/treeview: Protect TVM_GETITEM from invalid item pointers

Nikolay Sivov nsivov at
Fri Feb 22 01:41:45 CST 2013

Should fix regression

Tests show that all versions after nt4 tolerate invalid pointers for 
items, so since we support TVM_GETITEM from another tree for a while now 
it bypassed called tree item validation.
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