Remove the unused Port::next member.

portlist.cc

@@ -113,7 +113,6 @@ Port::Port() {
   rpc_status = RPC_STATUS_UNTESTED;
   rpc_program = rpc_lowver = rpc_highver = 0;
   state = 0;
-  next = NULL;
   serviceprobe_results = PROBESTATE_INITIAL;
   serviceprobe_service = NULL;
   serviceprobe_product = serviceprobe_version = serviceprobe_extrainfo = NULL;

portlist.h

@@ -226,8 +226,6 @@ class Port {
   unsigned long rpc_program; /* Only valid if rpc_state == RPC_STATUS_GOOD_PROG */
   unsigned int rpc_lowver;
   unsigned int rpc_highver;
-  Port *next; /* Internal use only -- we sometimes like to link them
-			together */
   enum serviceprobestate serviceprobe_results; // overall results of service scan
   char *serviceprobe_service; // If a service was discovered, points to the name
   // Any of these next three can be NULL if the details are not available