DxVA2: CoTaskMemFree can be used correctly now.

(cherry picked from commit bd2035eb)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/codec/avcodec/dxva2.c

@@ -58,9 +58,6 @@
 #include <shlwapi.h>
 #include <d3d9.h>
 
-/* FIXME */
-#define CoTaskMemFree(x)
-
 /* */
 #define DXVA2_E_NOT_INITIALIZED     MAKE_HRESULT(1, 4, 4096)
 #define DXVA2_E_NEW_VIDEO_DEVICE    MAKE_HRESULT(1, 4, 4097)