staging: comedi: adv_pci_dio: checkpatch.pl cleanup (fallthrough)

Fix these checkpatch.pl warnings:

WARNING: Possible switch case/default not preceeded by break or fallthrough comment
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/adv_pci_dio.c

@@ -827,7 +827,7 @@ static int pci_dio_reset(struct comedi_device *dev)
 		outb(0, dev->iobase + PCI1730_DO + 1);
 		outb(0, dev->iobase + PCI1730_IDO);
 		outb(0, dev->iobase + PCI1730_IDO + 1);
-		/* NO break there! */
+		/* fallthrough */
 	case TYPE_PCI1733:
 		/* disable interrupts */
 		outb(0, dev->iobase + PCI1730_3_INT_EN);
@@ -887,7 +887,7 @@ static int pci_dio_reset(struct comedi_device *dev)
 		outb(0x80, dev->iobase + PCI1753E_ICR1);
 		outb(0x80, dev->iobase + PCI1753E_ICR2);
 		outb(0x80, dev->iobase + PCI1753E_ICR3);
-		/* NO break there! */
+		/* fallthrough */
 	case TYPE_PCI1753:
 		outb(0x88, dev->iobase + PCI1753_ICR0); /* disable & clear
 							 * interrupts */