pinctrl: aw9523: add missing mutex_destroy

Otherwise the mutex remains after a failed kzalloc.

Signed-off-by: Rosen Penev <[e-mail]>
Link: https://lore.kernel.org/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pinctrl-aw9523.c

···
 	lockdep_set_subclass(&awi->i2c_lock, i2c_adapter_depth(client->adapter));
 
 	pdesc = devm_kzalloc(dev, sizeof(*pdesc), GFP_KERNEL);
-	if (!pdesc)
-		return -ENOMEM;
+	if (!pdesc) {
+		ret = -ENOMEM;
+		goto err_disable_vregs;
+	}
 
 	ret = aw9523_hw_init(awi);
 	if (ret)