Resolves threading issue in ChannelState.

Resolves issue in tuner controller where controller was not releasing
sourced tuner channels, preventing re-tuning to other frequencies.
Resolves issue with channel timeout on MPT1327 monitored traffic
channels

src/module/decode/event/CallEvent.java

@@ -310,6 +310,11 @@ public abstract class CallEvent implements Comparable<CallEvent>
 	@Override
 	public int compareTo( CallEvent other )
 	{
+		if( other != null && other == this )
+		{
+			return 0;
+		}
+		
 		return Long.compare( mEventStart, other.getEventStartTime() );
 	}
 }