[PATCH] iio: chemical: scd30: Add check for NULL in scd30_i2c_command

[Anastasia Belova <abelova@xxxxxxxxxxxxx>]

Check rsp for NULL-pointer before dereferencing.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: e510190e0139 ("iio: chemical: scd30: add I2C interface driver")
Signed-off-by: Anastasia Belova <abelova@xxxxxxxxxxxxx>
---
 drivers/iio/chemical/scd30_i2c.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/chemical/scd30_i2c.c b/drivers/iio/chemical/scd30_i2c.c
index bae479a4721f..84baf67fc0ce 100644
--- a/drivers/iio/chemical/scd30_i2c.c
+++ b/drivers/iio/chemical/scd30_i2c.c
@@ -101,8 +101,10 @@ static int scd30_i2c_command(struct scd30_state *state, enum scd30_cmd cmd, u16
 			return -EIO;
 		}
 
-		*rsp++ = buf[i];
-		*rsp++ = buf[i + 1];
+		if (rsp) {
+			*rsp++ = buf[i];
+			*rsp++ = buf[i + 1];
+		}
 	}
 
 	return 0;
-- 
2.30.2