chore: remove last mentions of ifc (#15075)

pkg/kafka/client/reader_client.go

@@ -9,7 +9,6 @@ import (
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
-	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/twmb/franz-go/pkg/kadm"
 	"github.com/twmb/franz-go/pkg/kgo"
@@ -36,7 +35,7 @@ func NewReaderClient(kafkaCfg kafka.Config, metrics *kprom.Metrics, logger log.L
 	)
 	client, err := kgo.NewClient(opts...)
 	if err != nil {
-		return nil, errors.Wrap(err, "creating kafka client")
+		return nil, fmt.Errorf("creating kafka client: %w", err)
 	}
 	if kafkaCfg.AutoCreateTopicEnabled {
 		setDefaultNumberOfPartitionsForAutocreatedTopics(kafkaCfg, client, logger)

pkg/kafka/partition/reader_service.go

@@ -91,10 +91,10 @@ func NewReaderService(
 	)
 
 	if err != nil {
-		return nil, errors.Wrap(err, "creating kafka reader")
+		return nil, fmt.Errorf("creating kafka reader: %w", err)
 	}
 
-	return newReaderServiceFromIfc(
+	return newReaderService(
 		ReaderConfig{
 			TargetConsumerLagAtStartup:    kafkaCfg.TargetConsumerLagAtStartup,
 			MaxConsumerLagAtStartup:       kafkaCfg.MaxConsumerLagAtStartup,
@@ -107,7 +107,7 @@ func NewReaderService(
 	), nil
 }
 
-func newReaderServiceFromIfc(
+func newReaderService(
 	cfg ReaderConfig,
 	reader Reader,
 	consumerFactory ConsumerFactory,