If the twl4030-madc device wasn't registered, and another device, such
as twl4030-madc-hwmon, calls twl4030_madc_conversion() a NULL pointer is
dereferenced.
Signed-off-by: NKyle Manna <kyle@kylemanna.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>