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/logbuffer/linebuffer_test.go b/metropolis/pkg/logbuffer/linebuffer_test.go
index c821a4b..699c3dc 100644
--- a/metropolis/pkg/logbuffer/linebuffer_test.go
+++ b/metropolis/pkg/logbuffer/linebuffer_test.go
@@ -32,7 +32,7 @@
 		if len(a) != len(b) {
 			return msg
 		}
-		for i, _ := range a {
+		for i := range a {
 			if a[i].String() != b[i] {
 				return msg
 			}