staging: comedi: dt2814: 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/dt2814.c

@@ -209,7 +209,7 @@ static irqreturn_t dt2814_interrupt(int irq, void *d)
 	int data;
 
 	if (!dev->attached) {
-		comedi_error(dev, "spurious interrupt");
+		dev_err(dev->class_dev, "spurious interrupt\n");
 		return IRQ_HANDLED;
 	}