hwmon: (s3c-hwmon) Fix build error

The previous patch, commit be4c23c9 was
from the wrong tree and thus broke the current build which had the
channel configuration name changed.

Fix the following build errors:

drivers/hwmon/s3c-hwmon.c: In function 's3c_hwmon_probe':
drivers/hwmon/s3c-hwmon.c:326: warning: initialization from incompatible pointer type
drivers/hwmon/s3c-hwmon.c:331: error: dereferencing pointer to incomplete type
drivers/hwmon/s3c-hwmon.c:336: error: dereferencing pointer to incomplete type

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>