staging: comedi: dt9812: checkpatch.pl cleanup (missing blank line)

Fix checkpatch.pl warning:

WARNING: Missing a blank line after declarations
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/dt9812.c

@@ -653,6 +653,7 @@ static int dt9812_find_endpoints(struct comedi_device *dev)
 
 	for (i = 0; i < host->desc.bNumEndpoints; ++i) {
 		int dir = -1;
+
 		ep = &host->endpoint[i].desc;
 		switch (i) {
 		case 0: