wined3d: Setting render target 0 to NULL in an application error.

dlls/wined3d/device.c

@@ -5758,14 +5758,13 @@ static HRESULT WINAPI IWineD3DDeviceImpl_SetRenderTarget(IWineD3DDevice *iface,
         return WINED3DERR_INVALIDCALL;
     }
 
-    /* MSDN says that null disables the render target
-    but a device must always be associated with a render target
-    nope MSDN says that we return invalid call to a null rendertarget with an index of 0
-    */
-    if (RenderTargetIndex == 0 && pRenderTarget == NULL) {
-        FIXME("Trying to set render target 0 to NULL\n");
+    /* Render target 0 can't be set to NULL. */
+    if (!pRenderTarget && !RenderTargetIndex)
+    {
+        WARN("Trying to set render target 0 to NULL.\n");
         return WINED3DERR_INVALIDCALL;
     }
+
     if (pRenderTarget && !(((IWineD3DSurfaceImpl *)pRenderTarget)->resource.usage & WINED3DUSAGE_RENDERTARGET)) {
         FIXME("(%p)Trying to set the render target to a surface(%p) that wasn't created with a usage of WINED3DUSAGE_RENDERTARGET\n",This ,pRenderTarget);
         return WINED3DERR_INVALIDCALL;