ddraw: Memory allocation size fix

[Andrew Talbot]

Changelog:
    ddraw: Memory allocation size fix.

diff --git a/dlls/ddraw/direct3d.c b/dlls/ddraw/direct3d.c
index 8d5d95e..ff24762 100644
--- a/dlls/ddraw/direct3d.c
+++ b/dlls/ddraw/direct3d.c
@@ -826,7 +826,7 @@ IDirect3DImpl_7_CreateDevice(IDirect3D7 *iface,
     object->wineD3DDevice = This->wineD3DDevice;
 
     /* Create an index buffer, it's needed for indexed drawing */
-    IndexBufferParent = HeapAlloc(GetProcessHeap(), 0, sizeof(IParentImpl *));
+    IndexBufferParent = HeapAlloc(GetProcessHeap(), 0, sizeof(IParentImpl));
     if(!IndexBufferParent)
     {
         ERR("Allocating memory for an index buffer parent failed\n");