staging: iio: accel: fix error check

[ Upstream commit ef3149eb3ddb7f9125e11c90f8330e371b55cffd ]

sca3000_read_ctrl_reg() returns a negative number on failure, check for
this instead of zero.

Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

diff --git a/drivers/staging/iio/accel/sca3000_core.c b/drivers/staging/iio/accel/sca3000_core.c
index b614f272b5f4b1b40071d4ea5e11678453a1f431..851fcfa98068259aedba2767a3c11767ea097501 100644 (file)
--- a/drivers/staging/iio/accel/sca3000_core.c
+++ b/drivers/staging/iio/accel/sca3000_core.c
@@ -595,7 +595,7 @@ static ssize_t sca3000_read_frequency(struct device *dev,
                goto error_ret_mut;
        ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
        mutex_unlock(&st->lock);
-       if (ret)
+       if (ret < 0)
                goto error_ret;
        val = ret;
        if (base_freq > 0)