In iOS 9 / El Cap, NSTimer enforces non-nullability of target/action.
In iOS 9 / El Cap, NSTimer enforces non-nullability of target/action.

Instead of using a timer that will never fire, just cook up a no-op
runloop source in order to prevent the _SRRunLoopThread's runloop from
spinning while we wait for the stream's runloop source to be added.

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