fixing the goroutine in two unit tests

server/storage/mvcc/kvstore_test.go

@@ -536,6 +536,8 @@ type hashKVResult struct {
 func TestHashKVWhenCompacting(t *testing.T) {
 	b, tmpPath := betesting.NewDefaultTmpBackend(t)
 	s := NewStore(zap.NewExample(), b, &lease.FakeLessor{}, StoreConfig{})
+	defer s.Close()
+	defer b.Close()
 	defer os.Remove(tmpPath)
 
 	rev := 10000

server/storage/mvcc/watchable_store_test.go

@@ -536,7 +536,8 @@ func TestWatchVictims(t *testing.T) {
 	s := newWatchableStore(zap.NewExample(), b, &lease.FakeLessor{}, StoreConfig{})
 
 	defer func() {
-		s.store.Close()
+		s.Close()
+		b.Close()
 		os.Remove(tmpPath)
 		chanBufLen, maxWatchersPerSync = oldChanBufLen, oldMaxWatchersPerSync
 	}()