iio: consumer.h: Fix kernel doc incosistency

For the iio_read_channel_raw and iio_read_channel_scale the kerneldoc comment
refers to an argument called "channel", while the argument is called "chan" in
the function signature. This leads to the following warnings from kerneldoc:

	Warning(include/linux/iio/consumer.h:71): No description found for parameter 'chan'
	Warning(include/linux/iio/consumer.h:71): Excess function parameter 'channel' description in 'iio_read_channel_raw'
	Warning(include/linux/iio/consumer.h:109): No description found for parameter 'chan'
	Warning(include/linux/iio/consumer.h:109): Excess function parameter 'channel' description in 'iio_read_channel_scale'

This patch fixes the warnings by naming them consistently.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

include/linux/iio/consumer.h

@@ -61,7 +61,7 @@ void iio_channel_release_all(struct iio_channel *chan);
 
 /**
  * iio_read_channel_raw() - read from a given channel
- * @channel:		The channel being queried.
+ * @chan:		The channel being queried.
  * @val:		Value read back.
  *
  * Note raw reads from iio channels are in adc counts and hence
@@ -82,7 +82,7 @@ int iio_get_channel_type(struct iio_channel *channel,
 
 /**
  * iio_read_channel_scale() - read the scale value for a channel
- * @channel:		The channel being queried.
+ * @chan:		The channel being queried.
  * @val:		First part of value read back.
  * @val2:		Second part of value read back.
  *