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/cloud/bmaas/scruffy/bmdb_stats_test.go b/cloud/bmaas/scruffy/bmdb_stats_test.go
index 89d5b5e..0d0f199 100644
--- a/cloud/bmaas/scruffy/bmdb_stats_test.go
+++ b/cloud/bmaas/scruffy/bmdb_stats_test.go
@@ -68,7 +68,7 @@
 				}
 			}
 		}
-		for mf, _ := range wantValues {
+		for mf := range wantValues {
 			if !gotValues[mf] {
 				t.Errorf("MetricFamily %s: missing", mf)
 			}