all: simplify nested complexity and if blocks ending with a return statement (#21854)

Changes:

    Simplify nested complexity
    If an if blocks ends with a return statement then remove the else nesting.

Most of the changes has also been reported in golint https://goreportcard.com/report/github.com/ethereum/go-ethereum#golint

les/lespay/server/balance.go

@@ -588,9 +588,8 @@ func (n *NodeBalance) timeUntil(priority int64) (time.Duration, bool) {
 			}
 			dt = float64(posBalance-newBalance) / timePrice
 			return time.Duration(dt), true
-		} else {
-			dt = float64(posBalance) / timePrice
 		}
+		dt = float64(posBalance) / timePrice
 	} else {
 		if priority > 0 {
 			return 0, false