cloud: fix %v in cases where we should use %w

Change-Id: I161fe87fbc2bf8c4c2c7756074fc1050f268121e
Reviewed-on: https://review.monogon.dev/c/monogon/+/3099
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/cloud/bmaas/scruffy/bmdb_stats.go b/cloud/bmaas/scruffy/bmdb_stats.go
index 68de363..338c91a 100644
--- a/cloud/bmaas/scruffy/bmdb_stats.go
+++ b/cloud/bmaas/scruffy/bmdb_stats.go
@@ -179,7 +179,7 @@
 		for _, c := range b.collectors {
 			res, err := c.def.query(q, ctx)
 			if err != nil {
-				return fmt.Errorf("collecting %s failed: %v", c.def.name, err)
+				return fmt.Errorf("collecting %s failed: %w", c.def.name, err)
 			} else {
 				results[c.def.name] = res
 			}