power: ipaq-micro-battery: freeing the wrong variable

BugLink: https://bugs.launchpad.net/bugs/1878232

commit b9223da4 upstream.

We accidentally free "micro_ac_power" which is an error pointer and it
leads to an oops.  We intended to free "micro_batt_power".

Fixes: a2c1d531 ('power_supply: ipaq_micro_battery: Check return values in probe')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/power/ipaq_micro_battery.c

@@ -261,7 +261,7 @@ static int micro_batt_probe(struct platform_device *pdev)
 	return 0;
 
 ac_err:
-	power_supply_unregister(micro_ac_power);
+	power_supply_unregister(micro_batt_power);
 batt_err:
 	cancel_delayed_work_sync(&mb->update);
 	destroy_workqueue(mb->wq);