staging: comedi: remove 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.

All of the users of this function have been converted to use dev_err()
directly. Remove the now unused function.
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/comedi_fops.c

@@ -2401,12 +2401,6 @@ static const struct file_operations comedi_fops = {
 	.llseek = noop_llseek,
 };
 
-void comedi_error(const struct comedi_device *dev, const char *s)
-{
-	dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
-}
-EXPORT_SYMBOL_GPL(comedi_error);
-
 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
 {
 	struct comedi_async *async = s->async;

drivers/staging/comedi/comedidev.h

@@ -280,7 +280,6 @@ static inline const void *comedi_board(const struct comedi_device *dev)
  */
 
 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
-void comedi_error(const struct comedi_device *dev, const char *s);
 
 /* we can expand the number of bits used to encode devices/subdevices into
  the minor number soon, after more distros support > 8 bit minor numbers

drivers/staging/comedi/drivers.c

@@ -591,8 +591,6 @@ int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 		ret = -ENOSYS;
 		goto out;
 	}
-	/* initialize dev->driver here so
-	 * comedi_error() can be called from attach */
 	dev->driver = driv;
 	dev->board_name = dev->board_ptr ? *(const char **)dev->board_ptr
 					 : dev->driver->driver_name;