Use z = std::max(x - y, 0); instead of z = x - y; if (z < 0) z = 0;

src/addrman.cpp

@@ -53,11 +53,7 @@ bool CAddrInfo::IsTerrible(int64_t nNow) const
 double CAddrInfo::GetChance(int64_t nNow) const
 {
     double fChance = 1.0;
-
+    int64_t nSinceLastTry = std::max<int64_t>(nNow - nLastTry, 0);
-    int64_t nSinceLastTry = nNow - nLastTry;
-
-    if (nSinceLastTry < 0)
-        nSinceLastTry = 0;
 
     // deprioritize very recent attempts away
     if (nSinceLastTry < 60 * 10)

src/qt/coincontroldialog.cpp

@@ -563,9 +563,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
         }
 
         // after fee
-        nAfterFee = nAmount - nPayFee;
+        nAfterFee = std::max<CAmount>(nAmount - nPayFee, 0);
-        if (nAfterFee < 0)
-            nAfterFee = 0;
     }
 
     // actually update labels