treewide: remove redundant loop vars

Change-Id: I61bada9e3df38e6a94cd6c8fe2d0d8f3ba41c1af
Reviewed-on: https://review.monogon.dev/c/monogon/+/2955
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/pkg/supervisor/supervisor_node.go b/metropolis/pkg/supervisor/supervisor_node.go
index 4fb2ddb..76d656c 100644
--- a/metropolis/pkg/supervisor/supervisor_node.go
+++ b/metropolis/pkg/supervisor/supervisor_node.go
@@ -242,7 +242,7 @@
 	}
 
 	// Check the requested runnable names.
-	for name, _ := range runnables {
+	for name := range runnables {
 		if !reNodeName.MatchString(name) {
 			return fmt.Errorf("runnable name %q is invalid", name)
 		}
@@ -272,7 +272,7 @@
 
 	// Schedule execution of group members.
 	go func() {
-		for name, _ := range runnables {
+		for name := range runnables {
 			n.sup.pReq <- &processorRequest{
 				schedule: &processorRequestSchedule{
 					dn: dns[name],