C++ PATCH to maybe_add_lambda_conv_op

[Jason Merrill]

Duncan Sands pointed out to me that it doesn't make much sense to use 
void_zero_node in this case, since we are actually using the value (and 
it causes problems for his plugin); he suggested that null_pointer_node 
would be better.  I agree.

Tested x86_64-pc-linux-gnu, applied to trunk since it only affects c++0x 
code.
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