wined3d: Just set the first render target to NULL in wined3d_device_reset().

dlls/wined3d/device.c

@@ -4704,14 +4704,12 @@ HRESULT CDECL wined3d_device_reset(struct wined3d_device *device,
 
     if (device->fb.render_targets)
     {
-        if (swapchain->back_buffers && swapchain->back_buffers[0])
-            wined3d_device_set_render_target(device, 0, swapchain->back_buffers[0], FALSE);
-        else
-            wined3d_device_set_render_target(device, 0, swapchain->front_buffer, FALSE);
-        for (i = 1; i < device->adapter->gl_info.limits.buffers; ++i)
+        for (i = 0; i < device->adapter->gl_info.limits.buffers; ++i)
         {
             wined3d_device_set_render_target(device, i, NULL, FALSE);
         }
+        if (swapchain->back_buffers && swapchain->back_buffers[0])
+            wined3d_device_set_render_target(device, 0, swapchain->back_buffers[0], FALSE);
     }
     wined3d_device_set_depth_stencil(device, NULL);