staging: comedi: fix typo in error message

Fix typo in error message of dux commands allocation.
Signed-off-by: Nicolas Kaiser <nikai@nikai.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/usbdux.c

@@ -2398,7 +2398,7 @@ static int usbduxsub_probe(struct usb_interface *uinterf,
 	usbduxsub[index].dux_commands = kzalloc(SIZEOFDUXBUFFER, GFP_KERNEL);
 	if (!usbduxsub[index].dux_commands) {
 		dev_err(dev, "comedi_: usbdux: "
-			"error alloc space for dac commands\n");
+			"error alloc space for dux commands\n");
 		tidy_up(&(usbduxsub[index]));
 		up(&start_stop_sem);
 		return -ENOMEM;