staging: comedi: s526: fix if() check in s526_gpct_winsn()

This if() check was flipped from a test for valid data params
to a test for invalid params.

As pointed out by Dan Carpenter, the orignal test was:

	if ((data[1] > data[0]) && (data[0] > 0)) {

the flipped test should be:

	if (data[1] <= data[0]) ...

Add the missing '='.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/s526.c

@@ -376,7 +376,7 @@ static int s526_gpct_winsn(struct comedi_device *dev,
 		   The above periods must be expressed as a multiple of the
 		   pulse frequency on the selected source
 		 */
-		if ((data[1] < data[0]) || !data[0])
+		if ((data[1] <= data[0]) || !data[0])
 			return -EINVAL;
 
 		/* Fall thru to write the PULSE_WIDTH */