cloud/bmaas/bmdb: check for transaction error

Change-Id: I438a3badd37aa029bd0be21b3a01165a7ad1d7e0
Reviewed-on: https://review.monogon.dev/c/monogon/+/2958
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Tested-by: Jenkins CI
diff --git a/cloud/bmaas/bmdb/reflection_test.go b/cloud/bmaas/bmdb/reflection_test.go
index 38118cb..8f365d8 100644
--- a/cloud/bmaas/bmdb/reflection_test.go
+++ b/cloud/bmaas/bmdb/reflection_test.go
@@ -36,7 +36,7 @@
 
 	// Create 10 test machines.
 	var mids []uuid.UUID
-	sess.Transact(ctx, func(q *model.Queries) error {
+	err = sess.Transact(ctx, func(q *model.Queries) error {
 		for i := 0; i < 10; i += 1 {
 			mach, err := q.NewMachine(ctx)
 			if err != nil {