clk: st: clk-flexgen: Unmap region obtained by of_iomap

Free memory mapping, if probe is not successful.

Signed-off-by: Arvind Yadav <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/st/clk-flexgen.c

···
 		return;
 
 	parents = flexgen_get_parents(np, &num_parents);
-	if (!parents)
+	if (!parents) {
+		iounmap(reg);
 		return;
+	}
 
 	match = of_match_node(flexgen_of_match, np);
 	if (match) {
···
 	return;
 
 err:
+	iounmap(reg);
 	if (clk_data)
 		kfree(clk_data->clks);
 	kfree(clk_data);