Mark todo a test that depended on the bug to succeed.

- Cleanup GetSrcAndOpFromValue().
- Use naming more consistent with the rest of the file.

msxml3: Initialise output interface pointers to NULL in xmlnodelist_QueryInterface and xmlnodelist_nextNode.

This is needed because IRpcStubBuffer::Invoke should not allow RPC
exceptions to be passed to the caller.

ComplexStructMemorySize from NdrComplexArrayUnmarshall.