Remove (POINTER)NULL casts.

diff --git a/dlls/msacm/internal.c b/dlls/msacm/internal.c
index 7d6c8f0..5d41368 100644
--- a/dlls/msacm/internal.c
+++ b/dlls/msacm/internal.c
@@ -39,7 +39,7 @@
 
 /**********************************************************************/
 
-HANDLE MSACM_hHeap = (HANDLE) NULL;
+HANDLE MSACM_hHeap = NULL;
 PWINE_ACMDRIVERID MSACM_pFirstACMDriverID = NULL;
 PWINE_ACMDRIVERID MSACM_pLastACMDriverID = NULL;