tpm/tpm_i2c_stm_st33: Fix coccinelle warnings. Possible NULL pointer dereference

If !client the kernel mays oops in dev_info when doing client->dev.
Reported-by: NPeter Huewe <peterhuewe@gmx.de>
Signed-off-by: NChristophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: NPeter Huewe <peterhuewe@gmx.de>

drivers/char/tpm/tpm_i2c_stm_st33.c

@@ -720,7 +720,7 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	struct tpm_stm_dev *tpm_dev;
 
 	if (!client) {
-		dev_info(&client->dev, "%s: i2c client is NULL. Device not accessible.\n",
+		pr_info("%s: i2c client is NULL. Device not accessible.\n",
 			__func__);
 		return -ENODEV;
 	}