[#541] writecache/test: Remove initWC()

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/local_object_storage/writecache/flush_test.go

@@ -65,7 +65,7 @@ func TestFlush(t *testing.T) {
 				WithBlobstor(bs),
 			}, opts...)...)
 		require.NoError(t, wc.Open(false))
-		initWC(t, wc)
+		require.NoError(t, wc.Init())
 
 		// First set mode for metabase and blobstor to prevent background flushes.
 		require.NoError(t, mb.SetMode(mode.ReadOnly))
@@ -229,10 +229,6 @@ func newObject(t *testing.T, size int) (*objectSDK.Object, []byte) {
 	return obj, data
 }
 
-func initWC(t *testing.T, wc Cache) {
-	require.NoError(t, wc.Init())
-}
-
 type dummyEpoch struct{}
 
 func (dummyEpoch) CurrentEpoch() uint64 {