clk: gpio: Unlock mutex on error path

We don't unlock the mutex if we fail to allocate the parent names
array. Unlock it and return an error in this case as well.
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Acked-by: NJulia Lawall <julia.lawall@lip6.fr>
Cc: Sergej Sawazki <ce3a@gmx.de>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>

drivers/clk/clk-gpio.c

@@ -251,8 +251,10 @@ static struct clk *of_clk_gpio_delayed_register_get(
 	num_parents = of_clk_get_parent_count(data->node);
 
 	parent_names = kcalloc(num_parents, sizeof(char *), GFP_KERNEL);
-	if (!parent_names)
-		return ERR_PTR(-ENOMEM);
+	if (!parent_names) {
+		clk = ERR_PTR(-ENOMEM);
+		goto out;
+	}
 
 	for (i = 0; i < num_parents; i++)
 		parent_names[i] = of_clk_get_parent_name(data->node, i);