Fix compiler warnings

sdrbase/util/dsc.cpp

@@ -905,6 +905,10 @@ bool DSCDecoder::decodeSymbol(signed char symbol)
         ret = true;
         break;
 
+    case DONE:
+    case NO_EOS:
+        break;
+
     }
 
     return ret;

sdrbase/util/mmsi.cpp

@@ -414,6 +414,7 @@ QString MMSI::getCategory(const QString &mmsi)
                 return "AtoN"; // Aid-to-navigation
             }
         }
+        break;
     default:
         return "Ship"; // Vessel better?
     }