[C++ Patch] PR 51290

[Paolo Carlini]

Hi,

another case of spurious -Wzero-as-null-pointer-constant, rather 
straightforward fix, IMHO. Well, with hindsight, I should have grepped 
more carefully for integer_zero_node, a couple of weeks ago ;)

Anyway, tested x86_64-linux. Ok?

Thanks,
Paolo.

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