[Coverity] Dead default in switch (DEADCODE)

src/olsr/model/olsr-routing-protocol.cc

@@ -2033,7 +2033,9 @@ RoutingProtocol::LinkSensing (const olsr::MessageHeader &msg,
         case OLSR_ASYM_LINK: linkTypeName = "ASYM_LINK"; break;
         case OLSR_SYM_LINK: linkTypeName = "SYM_LINK"; break;
         case OLSR_LOST_LINK: linkTypeName = "LOST_LINK"; break;
+          /*  no default, since lt must be in 0..3, covered above
         default: linkTypeName = "(invalid value!)";
+          */
         }
 
       const char *neighborTypeName;