d2d1: Remove superfluous casts to self.

dlls/d2d1/brush.c

@@ -1258,7 +1258,7 @@ static void STDMETHODCALLTYPE d2d_image_brush_GetImage(ID2D1ImageBrush *iface, I
 
     TRACE("iface %p, image %p.\n", iface, image);
 
-    if ((*image = (ID2D1Image *)brush->u.image.image))
+    if ((*image = brush->u.image.image))
         ID2D1Image_AddRef(*image);
 }
 

dlls/d2d1/device.c

@@ -2338,7 +2338,7 @@ static void STDMETHODCALLTYPE d2d_device_context_GetDevice(ID2D1DeviceContext1 *
 
     TRACE("iface %p, device %p.\n", iface, device);
 
-    *device = (ID2D1Device *)context->device;
+    *device = context->device;
     ID2D1Device_AddRef(*device);
 }
 

dlls/d2d1/tests/d2d1.c

@@ -9786,7 +9786,7 @@ static void test_command_list(BOOL d3d11)
     stroke_desc.dashStyle = D2D1_DASH_STYLE_DOT;
     stroke_desc.dashOffset = -1.0f;
 
-    hr = ID2D1Factory_CreateStrokeStyle((ID2D1Factory *)ctx.factory, &stroke_desc, NULL, 0, &stroke_style);
+    hr = ID2D1Factory_CreateStrokeStyle(ctx.factory, &stroke_desc, NULL, 0, &stroke_style);
     ok(hr == S_OK, "Got unexpected hr %#lx.\n", hr);
 
     set_color(&color, 0.0f, 0.0f, 0.0f, 0.0f);