Clear Out Parameters in ITypeInfo::Invoke

[Robert Shearman]

Hi,

I plan to rewrite ITypeInfo::Invoke because at the moment it is very 
buggy, incomplete and too big (over 250 lines). However, this patch 
fixes an issue where a function fails so doesn't set the out parameter 
to anything, so it leaves an invalid pointer there. I think the correct 
fix is that [retval] parameters should have a pointer allocated for 
them, but [out] parameters should pass in the byref value from the 
caller (i.e. passed in via the DISPPARAMS.rgvarg array).

Changelog:
Clear out parameters to stop bad pointers lying around in memory if the 
function doesn't set them to anything.

-- 
Rob Shearman

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