upgrade golangci-lint to v1.39.0

Signed-off-by: monkey <golang@88.com>

internal/pool/pool.go

@@ -228,8 +228,7 @@ func (p *ConnPool) Get(ctx context.Context) (*Conn, error) {
 		return nil, ErrClosed
 	}
 
-	err := p.waitTurn(ctx)
+	if err := p.waitTurn(ctx); err != nil {
-	if err != nil {
 		return nil, err
 	}
 

pubsub.go

@@ -118,7 +118,7 @@ func mapKeys(m map[string]struct{}) []string {
 	i := 0
 	for k := range m {
 		s[i] = k
-		i++ // nolint:wastedassign
+		i++
 	}
 	return s
 }