clk: add uclass id check to clk_get_parent()

Check the uclass id in clk_get_parent() before casting dev->priv to
struct clk *.  This sanity check can be also found in some other places
and should be enforced.

Reviewed-by: Simon Glass <simon.glass@canonical.com>
Signed-off-by: Yang Xiwen <forbidden405@outlook.com>

drivers/clk/clk-uclass.c

@@ -507,6 +507,10 @@ struct clk *clk_get_parent(struct clk *clk)
 	pdev = dev_get_parent(clk->dev);
 	if (!pdev)
 		return ERR_PTR(-ENODEV);
+
+	if (device_get_uclass_id(pdev) != UCLASS_CLK)
+		return ERR_PTR(-ENODEV);
+
 	pclk = dev_get_clk_ptr(pdev);
 	if (!pclk)
 		return ERR_PTR(-ENODEV);