staging: comedi: s626: remove unnecessary variable initialization

We initialize 'irqbit' to 0, only to properly set it immediately
afterwards.  Just remove the zero-initialization.
Signed-off-by: Chase Southwood <chase.southwood@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/s626.c

@@ -1399,7 +1399,6 @@ static void s626_check_dio_interrupts(struct comedi_device *dev)
 	uint8_t group;
 
 	for (group = 0; group < S626_DIO_BANKS; group++) {
-		irqbit = 0;
 		/* read interrupt type */
 		irqbit = s626_debi_read(dev, S626_LP_RDCAPFLG(group));