folly: avoid compile warning/failure due to lvalue-to-rvalue conversion
Summary: With gcc 7.2 we get the warning: folly/io/async/DelayedDestructionBase.h:252:20: error: parameter ‘right’ set but not used [-Werror=unused-but-set-parameter] std::nullptr_t right) { ^~~~~ I presume this is due to the implicit conversion, hence the named parameter is never assigned. Instead we use an explicit nullptr. Reviewed By: yfeldblum Differential Revision: D6279302 fbshipit-source-id: ed449601b0410c178777f20e82ed09d9097bd024
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