[PATCH 5.4 43/69] iio: ssp_sensors: fix error code in ssp_print_mcu_debug()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Dan Carpenter <dan.carpenter@oracle.com>

commit 4170d3dd1467e9d78cb9af374b19357dc324b328 upstream.

The ssp_print_mcu_debug() function should return negative error codes on
error.  Returning "length" is meaningless.  This change does not affect
runtime because the callers only care about zero/non-zero.

Reported-by: Jonathan Cameron <jic23@kernel.org>
Fixes: 50dd64d57eee ("iio: common: ssp_sensors: Add sensorhub driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210914105333.GA11657@kili
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/iio/common/ssp_sensors/ssp_spi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/common/ssp_sensors/ssp_spi.c
+++ b/drivers/iio/common/ssp_sensors/ssp_spi.c
@@ -137,7 +137,7 @@ static int ssp_print_mcu_debug(char *dat
 	if (length > received_len - *data_index || length <= 0) {
 		ssp_dbg("[SSP]: MSG From MCU-invalid debug length(%d/%d)\n",
 			length, received_len);
-		return length ? length : -EPROTO;
+		return -EPROTO;
 	}
 
 	ssp_dbg("[SSP]: MSG From MCU - %s\n", &data_frame[*data_index]);