ios: fix xcode warnning for unused variable.
ios: fix xcode warnning for unused variable.

node: whether enable overrideAudioPort or not, both works.
but if overrideAudioPort enabled, it seems became a little bit buggy.

still disable for now, need more observation.

zxcpoiu/react-native-incall-manager,zxcpoiu/react-native-incall-manager,zxcpoiu/react-native-incall-manager