registry: refactor maybePrintEnvAuthWarning function

Signed-off-by: Alano Terblanche <18033717+Benehiko@users.noreply.github.com>

Author: Benehiko

cli/command/registry/warning.go

@@ -3,20 +3,16 @@ package registry
 import (
 	"os"
 
+	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/cli/config/configfile"
-	"github.com/docker/cli/cli/streams"
 	"github.com/docker/cli/internal/tui"
 )
 
-type outErr interface {
-	Err() *streams.Out
-}
-
 // maybePrintEnvAuthWarning if the `DOCKER_AUTH_CONFIG` environment variable is
 // set this function will output a warning to stdErr
-func maybePrintEnvAuthWarning(out outErr) {
+func maybePrintEnvAuthWarning(out command.Streams) {
 	if os.Getenv(configfile.DockerEnvConfigKey) != "" {
-		out := tui.NewOutput(out.Err())
-		out.PrintWarning("%[1]s is set and takes precedence.\nUnset %[1]s to restore the CLI auth behaviour.\n", configfile.DockerEnvConfigKey)
+		tui.NewOutput(out.Err()).
+			PrintWarning("%[1]s is set and takes precedence.\nUnset %[1]s to restore the CLI auth behaviour.\n", configfile.DockerEnvConfigKey)
 	}
 }