Fixed some warnings.

dlls/ddraw/ddraw/x11.c

diff --git a/dlls/ddraw/ddraw/x11.c b/dlls/ddraw/ddraw/x11.c
index ba96759..5ab465d 100644
--- a/dlls/ddraw/ddraw/x11.c
+++ b/dlls/ddraw/ddraw/x11.c
@@ -912,7 +912,7 @@
     }
     if ( IsEqualGUID( &IID_IDirectDraw7, refiid ) ) {
 	IDirectDraw4Impl *dd = HeapAlloc(GetProcessHeap(),0,sizeof(*dd));
-	dd->ref = 1;ICOM_VTBL(dd) = &xlib_dd7vt;dd->d = This->d;This->d->ref++;
+	dd->ref = 1;ICOM_VTBL(dd) = (ICOM_VTABLE(IDirectDraw4)*)&xlib_dd7vt;dd->d = This->d;This->d->ref++;
 	*obj = dd;
 
 	IDirectDraw7_AddRef(iface);