linnsongcast: always pass ReceiverState by reference
When ReceiverState is passed by value, the error reason in
setReceiverPlaying() and stopReceiver() is always empty for the
caller.
Therefore, pass ReceiverState by reference.
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When ReceiverState is passed by value, the error reason in
setReceiverPlaying() and stopReceiver() is always empty for the
caller.
Therefore, pass ReceiverState by reference.