Fixes gcc '-Wunused-but-set-variable' warning:

drivers/staging/comedi/drivers/dt2814.c: In function dt2814_interrupt:
drivers/staging/comedi/drivers/dt2814.c:193:6: warning: variable data set but 
not used [-Wunused-but-set-variable]

It is not used since commit 7806012e97ed ("staging:
comedi: refactor dt2814 driver and use module_comedi_driver")

Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: zhengbin <zhengbi...@huawei.com>
---
 drivers/staging/comedi/drivers/dt2814.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/staging/comedi/drivers/dt2814.c 
b/drivers/staging/comedi/drivers/dt2814.c
index d2c7157..4825168 100644
--- a/drivers/staging/comedi/drivers/dt2814.c
+++ b/drivers/staging/comedi/drivers/dt2814.c
@@ -190,7 +190,6 @@ static irqreturn_t dt2814_interrupt(int irq, void *d)
        struct comedi_device *dev = d;
        struct dt2814_private *devpriv = dev->private;
        struct comedi_subdevice *s = dev->read_subdev;
-       int data;

        if (!dev->attached) {
                dev_err(dev->class_dev, "spurious interrupt\n");
@@ -200,8 +199,6 @@ static irqreturn_t dt2814_interrupt(int irq, void *d)
        hi = inb(dev->iobase + DT2814_DATA);
        lo = inb(dev->iobase + DT2814_DATA);

-       data = (hi << 4) | (lo >> 4);
-
        if (!(--devpriv->ntrig)) {
                int i;

--
2.7.4

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