[Nfd-dev] code style rule 3.20

[Junxiao Shi]

Dear folks

rule 3.20 states: 0 should be used instead of NULL.

In C++ 11, a null pointer is typically written as std::nullptr.
Usage of std::nullptr is already permitted, because it doesn't violate this
rule.

Should we amend this rule as follows?
"std::nullptr" should be used to represent null pointer.

Yours, Junxiao
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