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

Fix the checkpatch.pl warnings:

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/ni_tio.c

@@ -463,6 +463,7 @@ static int ni_tio_set_counter_mode(struct ni_gpct *counter, unsigned mode)
 
 	if (ni_tio_counting_mode_registers_present(counter_dev)) {
 		unsigned counting_mode_bits = 0;
+
 		counting_mode_bits |=
 		    (mode >> NI_GPCT_COUNTING_MODE_SHIFT) &
 		    Gi_Counting_Mode_Mask;