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/consensus/logparser.go b/metropolis/node/core/consensus/logparser.go
index f4f5a4f..c54968c 100644
--- a/metropolis/node/core/consensus/logparser.go
+++ b/metropolis/node/core/consensus/logparser.go
@@ -91,7 +91,7 @@
 
 	// Sort extra keys alphabetically.
 	extraKeys := make([]string, 0, len(e.Extras))
-	for k, _ := range e.Extras {
+	for k := range e.Extras {
 		extraKeys = append(extraKeys, k)
 	}
 	sort.Strings(extraKeys)