Use an unsigned int for --max-retries and related values.

NmapOps.h

@@ -218,7 +218,7 @@ class NmapOps {
   void setMinRttTimeout(int rtt);
   void setInitialRttTimeout(int rtt);
   void setMaxRetransmissions(int max_retransmit);
-  int getMaxRetransmissions() { return max_retransmissions; }
+  unsigned int getMaxRetransmissions() { return max_retransmissions; }
 
   /* Similar functions for Host group size */
   int minHostGroupSz() { return min_host_group_sz; }
@@ -373,7 +373,7 @@ class NmapOps {
   int max_rtt_timeout;
   int min_rtt_timeout;
   int initial_rtt_timeout;
-  int max_retransmissions;
+  unsigned int max_retransmissions;
   unsigned int max_tcp_scan_delay;
   unsigned int max_udp_scan_delay;
   unsigned int max_sctp_scan_delay;

scan_engine.cc

@@ -166,7 +166,7 @@ struct ultra_scan_performance_vars : public scan_performance_vars {
   /* Try to send a scanping if no response has been received from a target host
      in this many usecs */
   int pingtime;
-  int tryno_cap; /* The maximum trynumber (starts at zero) allowed */
+  unsigned int tryno_cap; /* The maximum trynumber (starts at zero) allowed */
 
   void init() {
     scan_performance_vars::init();
@@ -1395,7 +1395,7 @@ unsigned int HostScanStats::allowedTryno(bool *capped, bool *mayincrease) {
 
   /* TODO: This should perhaps differ by scan type. */
   maxval = MAX(1, max_successful_tryno + 1);
-  if (maxval > (unsigned int) USI->perf.tryno_cap) {
+  if (maxval > USI->perf.tryno_cap) {
     if (capped)
       *capped = true;
     maxval = USI->perf.tryno_cap;
@@ -2456,7 +2456,7 @@ static u16 sport_encode(UltraScanInfo *USI, u16 base_portno, unsigned int trynum
    otherwise. */
 static bool sport_decode(const UltraScanInfo *USI, u16 base_portno, u16 portno,
                          unsigned int *trynum, unsigned int *pingseq) {
-  int t;
+  unsigned int t;
 
   t = portno - base_portno;
   if (t > USI->perf.tryno_cap + 256) {

traceroute.cc

@@ -273,7 +273,7 @@ private:
   /* This is incremented with each instantiated probe. */
   static u16 token_counter;
 
-  int num_resends;
+  unsigned int num_resends;
 
 public:
   HostState *host;