power: supply: cpcap-charger: Fix power_supply_put on null battery pointer
Currently if the pointer battery is null there is a null pointer
dereference on the call to power_supply_put. Fix this by only
performing the put if battery is not null.
Addresses-Coverity: ("Dereference after null check") Fixes: 4bff91bb3231 ("power: supply: cpcap-charger: Fix missing power_supply_put()") Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>