#1856 DMR traffic channel thread dead-lock. Removing synchronized met…

…hod access since content access is already protected by the reentrant lock. The synchronized method is redundant and also causing the dead-lock. (#1857)

Co-authored-by: Dennis Sheirer <dsheirer@github.com>

src/main/java/io/github/dsheirer/module/decode/dmr/DMRTrafficChannelManager.java

@@ -805,7 +805,7 @@ else if(!decodeEvent2.getDetails().endsWith(CHANNEL_START_REJECTED))
          * @param channelEvent to process
          */
         @Override
-        public synchronized void receive(ChannelEvent channelEvent)
+        public void receive(ChannelEvent channelEvent)
         {
             Channel channel = channelEvent.getChannel();