staging: comedi: pcl816: remove use of comedi_error()

The comedi_error() function is just a wrapper around dev_err() that adds
the dev->driver->driver_name prefix to the message and a terminating
new-line character. The addition of the driver_name is just added noise
and some of the users of comedi_error() add unnecessary additional new-line
characters.

Use dev_err() directly instead of comedi_error() to avoid any confusion
and so that all the comedi generated kernel messages have the same format.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/pcl816.c

@@ -552,7 +552,7 @@ check_channel_list(struct comedi_device *dev,
 
 	/*  correct channel and range number check itself comedi/range.c */
 	if (chanlen < 1) {
-		comedi_error(dev, "range/channel list is empty!");
+		dev_err(dev->class_dev, "range/channel list is empty!\n");
 		return 0;
 	}