iio: inkern: Remove the 'unused' variable usage in iio_channel_read_max()

The code uses a local variable to initialize a null pointer in order to
avoid accessing this null pointer later on.

Simply removed the 'unused' variable and check for the null pointer just
before accessing it.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/20230623085830.749991-6-herve.codina@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index f738db9..ce537b4 100644 (file)
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -849,14 +849,10 @@ static int iio_channel_read_max(struct iio_channel *chan,
                                int *val, int *val2, int *type,
                                enum iio_chan_info_enum info)
 {
-       int unused;
        const int *vals;
        int length;
        int ret;
 
-       if (!val2)
-               val2 = &unused;
-
        ret = iio_channel_read_avail(chan, &vals, type, &length, info);
        if (ret < 0)
                return ret;
@@ -869,7 +865,8 @@ static int iio_channel_read_max(struct iio_channel *chan,
                        break;
                default:
                        *val = vals[4];
-                       *val2 = vals[5];
+                       if (val2)
+                               *val2 = vals[5];
                }
                return 0;