Merge pull request #3411 from mxpv/linter

Switch from gometalinter to golangci-lint

cmd/ctr/commands/events/events.go

@@ -47,7 +47,7 @@ var Command = cli.Command{
 			var e *events.Envelope
 			select {
 			case e = <-eventsCh:
-			case err, open = <-errCh:
+			case err = <-errCh:
 				return err
 			}
 			if e != nil {

cmd/ctr/commands/plugins/plugins.go

@@ -27,7 +27,7 @@ import (
 	"github.com/containerd/containerd/api/types"
 	"github.com/containerd/containerd/cmd/ctr/commands"
 	"github.com/containerd/containerd/platforms"
-	"github.com/opencontainers/image-spec/specs-go/v1"
+	v1 "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/urfave/cli"
 	"google.golang.org/grpc/codes"
 )