iio: magnetometer: hmc5843: Fixed a comment error.

Replace 'hcm5843' with 'hmc5843'.
Signed-off-by: Song Qiang <songqiang1304521@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/magnetometer/hmc5843.h

@@ -31,7 +31,7 @@ enum hmc5843_ids {
 };
 
 /**
- * struct hcm5843_data	- device specific data
+ * struct hmc5843_data	- device specific data
  * @dev:		actual device
  * @lock:		update and read regmap data
  * @regmap:		hardware access register maps