Staging: comedi: make use of ARRAY_SIZE macro

Replace instances of computing number of elements in an array with
sizeof(foo)/sizeof(struct footype) with the ARRAY_SIZE macro.

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/comedi/drivers/ni_daq_700.c b/drivers/staging/comedi/drivers/ni_daq_700.c
index 3f0c1b3..f01c0b0 100644
--- a/drivers/staging/comedi/drivers/ni_daq_700.c
+++ b/drivers/staging/comedi/drivers/ni_daq_700.c
@@ -104,7 +104,7 @@
 	.module = THIS_MODULE,
 	.attach = dio700_attach,
 	.detach = dio700_detach,
-	.num_names = sizeof(dio700_boards) / sizeof(struct dio700_board),
+	.num_names = ARRAY_SIZE(dio700_boards),
 	.board_name = &dio700_boards[0].name,
 	.offset = sizeof(struct dio700_board),
 };