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_processor.go b/metropolis/pkg/supervisor/supervisor_processor.go
index 8b5b336..816298d 100644
--- a/metropolis/pkg/supervisor/supervisor_processor.go
+++ b/metropolis/pkg/supervisor/supervisor_processor.go
@@ -309,7 +309,7 @@
 
 	// Cancel all siblings.
 	if n.parent != nil {
-		for name, _ := range n.parent.groupSiblings(n.name) {
+		for name := range n.parent.groupSiblings(n.name) {
 			if name == n.name {
 				continue
 			}
@@ -374,7 +374,7 @@
 
 	// We build a queue of nodes to visit, starting from the leaves.
 	queue = []*node{}
-	for l, _ := range leaves {
+	for l := range leaves {
 		queue = append(queue, s.nodeByDN(l))
 	}
 
@@ -493,7 +493,7 @@
 	}
 
 	// Reinitialize and reschedule all subtrees
-	for dn, _ := range can {
+	for dn := range can {
 		n := s.nodeByDN(dn)
 
 		// Only back off when the node unexpectedly died - not when it got