amstream: Use the ARRAY_SIZE() macro.

dlls/amstream/main.c

@@ -174,13 +174,13 @@ HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
 	 && ! IsEqualGUID( &IID_IUnknown, riid) )
 	return E_NOINTERFACE;
 
-    for (i=0; i < sizeof(object_creation)/sizeof(object_creation[0]); i++)
+    for (i = 0; i < ARRAY_SIZE(object_creation); i++)
     {
 	if (IsEqualGUID(object_creation[i].clsid, rclsid))
 	    break;
     }
 
-    if (i == sizeof(object_creation)/sizeof(object_creation[0]))
+    if (i == ARRAY_SIZE(object_creation))
     {
 	FIXME("%s: no class found.\n", debugstr_guid(rclsid));
 	return CLASS_E_CLASSNOTAVAILABLE;

dlls/amstream/tests/amstream.c

@@ -479,7 +479,7 @@ static void test_media_streams(void)
                 ok(!lstrcmpW(info.achName, id), "Pin name is %s instead of %s\n", wine_dbgstr_w(info.achName), wine_dbgstr_w(id));
                 hr = IPin_EnumMediaTypes(pins[i], &enum_media_types);
                 ok(hr == S_OK, "IPin_EnumMediaTypes returned: %x\n", hr);
-                hr = IEnumMediaTypes_Next(enum_media_types, sizeof(media_types) / sizeof(media_types[0]), media_types, &nb_media_types);
+                hr = IEnumMediaTypes_Next(enum_media_types, ARRAY_SIZE(media_types), media_types, &nb_media_types);
                 ok(SUCCEEDED(hr), "IEnumMediaTypes_Next returned: %x\n", hr);
                 ok(nb_media_types > 0, "nb_media_types should be >0\n");
                 IEnumMediaTypes_Release(enum_media_types);