d3d8: Remove pointless casts to the type of the casted expression.

dlls/d3d8/cubetexture.c

@@ -97,7 +97,7 @@ static HRESULT WINAPI IDirect3DCubeTexture8Impl_GetDevice(IDirect3DCubeTexture8
 
     TRACE("iface %p, device %p.\n", iface, device);
 
-    *device = (IDirect3DDevice8 *)This->parentDevice;
+    *device = This->parentDevice;
     IDirect3DDevice8_AddRef(*device);
 
     TRACE("Returning device %p.\n", *device);

dlls/d3d8/surface.c

@@ -134,7 +134,7 @@ static HRESULT WINAPI IDirect3DSurface8Impl_GetDevice(IDirect3DSurface8 *iface,
         return hr;
     }
 
-    *device = (IDirect3DDevice8 *)This->parentDevice;
+    *device = This->parentDevice;
     IDirect3DDevice8_AddRef(*device);
 
     TRACE("Returning device %p.\n", *device);

dlls/d3d8/texture.c

@@ -96,7 +96,7 @@ static HRESULT WINAPI IDirect3DTexture8Impl_GetDevice(IDirect3DTexture8 *iface,
 
     TRACE("iface %p, device %p.\n", iface, device);
 
-    *device = (IDirect3DDevice8 *)This->parentDevice;
+    *device = This->parentDevice;
     IDirect3DDevice8_AddRef(*device);
 
     TRACE("Returning device %p.\n", *device);

dlls/d3d8/volumetexture.c

@@ -95,7 +95,7 @@ static HRESULT WINAPI IDirect3DVolumeTexture8Impl_GetDevice(IDirect3DVolumeTextu
 
     TRACE("iface %p, device %p.\n", iface, device);
 
-    *device = (IDirect3DDevice8 *)This->parentDevice;
+    *device = This->parentDevice;
     IDirect3DDevice8_AddRef(*device);
 
     TRACE("Returning device %p.\n", *device);