staging: comedi: ni_labpc_pci: tidy up bit define

As suggested by checkpatch.pl:
CHECK: Prefer using the BIT macro
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_labpc_pci.c

@@ -52,7 +52,7 @@ static const struct labpc_boardinfo labpc_pci_boards[] = {
 
 /* ripped from mite.h and mite_setup2() to avoid mite dependency */
 #define MITE_IODWBSR	0xc0	/* IO Device Window Base Size Register */
-#define WENAB		(1 << 7) /* window enable */
+#define WENAB		BIT(7)	/* window enable */
 
 static int labpc_pci_mite_init(struct pci_dev *pcidev)
 {