hwmon: (amc6821) Fix return value

commit 3499e5b2e14b792fe411302fea3b6fcc4ba40ef2 upstream.

Propagate return value obtained from i2c_smbus_read_byte_data()
instead of hardcoding.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Cc: T. Mertelj <tomaz.mertelj@guest.arnes.si>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --cc drivers/hwmon/amc6821.c
Simple merge