[vtkusers] Leak + Segfault in XML Image Reader

[Kevin H. Hobbs]

Hunting through vtkXMLDataParser.cxx in ddd for the source of my leak
and segfault I see that at line 668 which is :

	memcpy(data, blockBuffer+beginBlockOffset, n);

sometimes (data + n) > blockBuffer so the memcopy will overwrite
blockBuffer. Specifically I see on about the 75th time I get to a
breakpoint here :

	memcpy(5404388, 5404432+0, 112);

5404388 + 112 = 5404500. Oops! 
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