#2066 P25 Phase 1 frequency band link control messages are now checked for valid CRC before being used. (#2067)

Co-authored-by: Dennis Sheirer <[email protected]>

Author: DSheirer

src/main/java/io/github/dsheirer/module/decode/p25/phase1/P25P1MessageProcessor.java

@@ -236,13 +236,13 @@ private void dispatch(IMessage message)
         processForFrequencyBands(message);
 
         //Also process the link control messages for frequency bands.
-        if(message instanceof LDU1Message ldu1)
+        if(message instanceof LDU1Message ldu1 && ldu1.getLinkControlWord() instanceof LinkControlWord lcw && lcw.isValid())
         {
-            processForFrequencyBands(ldu1.getLinkControlWord());
+            processForFrequencyBands(lcw);
         }
-        else if(message instanceof TDULCMessage tdulc)
+        else if(message instanceof TDULCMessage tdulc && tdulc.getLinkControlWord() instanceof LinkControlWord lcw && lcw.isValid())
         {
-            processForFrequencyBands(tdulc.getLinkControlWord());
+            processForFrequencyBands(lcw);
         }
 
         if(mMessageListener != null)