[#1510] metabase/test: Fix BenchmarkListWithCursor

- Fix misplaced `(*DB).Close` (broken after 47dcfa20f3)
- Use `errors.Is` for error checking (broken after fcdbf5e509)

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

pkg/local_object_storage/metabase/list_test.go

@@ -18,6 +18,8 @@ import (
 
 func BenchmarkListWithCursor(b *testing.B) {
 	db := listWithCursorPrepareDB(b)
+	defer func() { require.NoError(b, db.Close(context.Background())) }()
+
 	b.Run("1 item", func(b *testing.B) {
 		benchmarkListWithCursor(b, db, 1)
 	})
@@ -33,7 +35,6 @@ func listWithCursorPrepareDB(b *testing.B) *meta.DB {
 	db := newDB(b, meta.WithMaxBatchSize(1), meta.WithBoltDBOptions(&bbolt.Options{
 		NoSync: true,
 	})) // faster single-thread generation
-	defer func() { require.NoError(b, db.Close(context.Background())) }()
 
 	obj := testutil.GenerateObject()
 	for i := range 100_000 { // should be a multiple of all batch sizes
@@ -55,7 +56,7 @@ func benchmarkListWithCursor(b *testing.B, db *meta.DB, batchSize int) {
 	for range b.N {
 		res, err := db.ListWithCursor(context.Background(), prm)
 		if err != nil {
-			if err != meta.ErrEndOfListing {
+			if errors.Is(err, meta.ErrEndOfListing) {
 				b.Fatalf("error: %v", err)
 			}
 			prm.SetCursor(nil)