"chanlist" was left over, we don't need it any more.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/staging/comedi/comedi_fops.c 
b/drivers/staging/comedi/comedi_fops.c
index ea6dc36..1e91161 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1597,7 +1597,6 @@ static int do_cmdtest_ioctl(struct comedi_device *dev,
 {
        struct comedi_cmd cmd;
        struct comedi_subdevice *s;
-       unsigned int *chanlist = NULL;
        unsigned int __user *user_chanlist;
        int ret;
 
@@ -1626,8 +1625,6 @@ static int do_cmdtest_ioctl(struct comedi_device *dev,
                ret = -EFAULT;
        }
 
-       kfree(chanlist);
-
        return ret;
 }
 
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