refactor: add all wait group delta at once when possible (#1179)

lint/linter.go

@@ -102,8 +102,8 @@ func (l *Linter) Lint(packages [][]string, ruleSet []Rule, config Config) (<-cha
 	}
 
 	var wg sync.WaitGroup
+	wg.Add(len(packages))
 	for n := range packages {
-		wg.Add(1)
 		go func(pkg []string, gover *goversion.Version) {
 			if err := l.lintPackage(pkg, gover, ruleSet, config, failures); err != nil {
 				fmt.Fprintln(os.Stderr, err)