iio: adc: ina2xx: Avoid double reference counting from get_task_struct/put_task_struct()

kthread_run() and kthread_stop() already do reference
counting of the task, so remove get_task_struct/put_task_struct()
to avoid double reference counting.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Link: https://lore.kernel.org/r/20211021124254.3247-2-caihuoqing@baidu.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ina2xx-adc.c

@@ -849,7 +849,6 @@ static int ina2xx_buffer_enable(struct iio_dev *indio_dev)
 	if (IS_ERR(task))
 		return PTR_ERR(task);
 
-	get_task_struct(task);
 	chip->task = task;
 
 	return 0;
@@ -861,7 +860,6 @@ static int ina2xx_buffer_disable(struct iio_dev *indio_dev)
 
 	if (chip->task) {
 		kthread_stop(chip->task);
-		put_task_struct(chip->task);
 		chip->task = NULL;
 	}