clk: rockchip: handle of_iomap failures in legacy clock driver

Check return value of of_iomap and handle errors correctly.

Signed-off-by: Arvind Yadav <[e-mail]>
Signed-off-by: Heiko Stuebner <[e-mail]>

drivers/clk/rockchip/clk-rockchip.c

···
 	}
 
 	reg = of_iomap(node, 0);
+	if (!reg)
+		return;
 
 	clk_data = kzalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
-	if (!clk_data)
+	if (!clk_data) {
+		iounmap(reg);
 		return;
+	}
 
 	clk_data->clks = kzalloc(qty * sizeof(struct clk *), GFP_KERNEL);
 	if (!clk_data->clks) {
 		kfree(clk_data);
+		iounmap(reg);
 		return;
 	}