replace len(x)<=0 with len(x)==0

length can't be negative.

Found using https://go-critic.github.io/overview#sloppyLen-ref

Author: quasilyte

cmd/gosec/main.go

@@ -262,7 +262,7 @@ func main() {
 
 	// Load enabled rule definitions
 	ruleDefinitions := loadRules(*flagRulesInclude, *flagRulesExclude)
-	if len(ruleDefinitions) <= 0 {
+	if len(ruleDefinitions) == 0 {
 		logger.Fatal("cannot continue: no rules are configured.")
 	}