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/node/core/rpc/peerinfo.go b/metropolis/node/core/rpc/peerinfo.go
index 9e9476d..6a8443b 100644
--- a/metropolis/node/core/rpc/peerinfo.go
+++ b/metropolis/node/core/rpc/peerinfo.go
@@ -20,7 +20,7 @@
 func (p Permissions) String() string {
 	var res []string
 
-	for k, _ := range p {
+	for k := range p {
 		res = append(res, k.String())
 	}
 
diff --git a/metropolis/node/core/rpc/resolver/processor.go b/metropolis/node/core/rpc/resolver/processor.go
index 40174bf..ad29021 100644
--- a/metropolis/node/core/rpc/resolver/processor.go
+++ b/metropolis/node/core/rpc/resolver/processor.go
@@ -166,12 +166,12 @@
 				}
 			}
 			toDelete := make(map[string]bool)
-			for nid, _ := range curMap.curators {
+			for nid := range curMap.curators {
 				if req.nu.nodes[nid] == nil {
 					toDelete[nid] = true
 				}
 			}
-			for nid, _ := range toDelete {
+			for nid := range toDelete {
 				delete(curMap.curators, nid)
 			}
 		case req.sa != nil:
@@ -284,7 +284,7 @@
 // received by the curator updater, and the seeds provided by the user.
 func (m *curatorMap) candidates() []string {
 	resMap := make(map[string]bool)
-	for ep, _ := range m.seeds {
+	for ep := range m.seeds {
 		resMap[ep] = true
 	}
 	for nid, v := range m.curators {
@@ -295,7 +295,7 @@
 		}
 	}
 	var res []string
-	for ep, _ := range resMap {
+	for ep := range resMap {
 		res = append(res, ep)
 	}
 	sort.Strings(res)
diff --git a/metropolis/node/core/rpc/resolver/resolver.go b/metropolis/node/core/rpc/resolver/resolver.go
index 2e1fc99..4e79bae 100644
--- a/metropolis/node/core/rpc/resolver/resolver.go
+++ b/metropolis/node/core/rpc/resolver/resolver.go
@@ -281,7 +281,7 @@
 		for k, v := range dbg.curmap.curators {
 			msg = append(msg, fmt.Sprintf("curator: %s/%s", k, v.endpoint))
 		}
-		for k, _ := range dbg.curmap.seeds {
+		for k := range dbg.curmap.seeds {
 			msg = append(msg, fmt.Sprintf("seed: %s", k))
 		}
 		if dbg.leader != nil {