iio: adc: palmas_gpadc: Drop duplicated the in comment.

In line 460 of the palmas_gpadc.c file, fix kernel comment errors.
Signed-off-by: Andy Shen Shen <shengaoya@inspur.com>
Link: https://lore.kernel.org/r/20230921031444.63594-1-shengaoya@inspur.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/palmas_gpadc.c

@@ -457,7 +457,7 @@ static int palmas_gpadc_get_calibrated_code(struct palmas_gpadc *adc,
  *
  * The gain error include both gain error, as specified in the datasheet, and
  * the gain error drift. These paramenters vary depending on device and whether
- * the the channel is calibrated (trimmed) or not.
+ * the channel is calibrated (trimmed) or not.
  */
 static int palmas_gpadc_threshold_with_tolerance(int val, const int INL,
 						 const int gain_error,