Fix revive linter errors

Golangci-lint is now running version 1.52.1. This introduced some errors.

Signed-off-by: Marcelo Guerrero Viveros <marguerr@redhat.com>

plugins/meta/bandwidth/main.go

@@ -236,11 +236,7 @@ func cmdDel(args *skel.CmdArgs) error {
 
 	ifbDeviceName := getIfbDeviceName(conf.Name, args.ContainerID)
 
-	if err := TeardownIfb(ifbDeviceName); err != nil {
-		return err
-	}
-
-	return nil
+	return TeardownIfb(ifbDeviceName)
 }
 
 func main() {