ice: Add check for kzalloc

Add the check for the return value of kzalloc in order to avoid
NULL pointer dereference.
Moreover, use the goto-label to share the clean code.

Fixes: d6b98c8d ("ice: add write functionality for GNSS TTY")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_gnss.c

@@ -461,6 +461,9 @@ static struct tty_driver *ice_gnss_create_tty_driver(struct ice_pf *pf)
 	for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++) {
 		pf->gnss_tty_port[i] = kzalloc(sizeof(*pf->gnss_tty_port[i]),
 					       GFP_KERNEL);
+		if (!pf->gnss_tty_port[i])
+			goto err_out;
+
 		pf->gnss_serial[i] = NULL;
 
 		tty_port_init(pf->gnss_tty_port[i]);
@@ -470,21 +473,23 @@ static struct tty_driver *ice_gnss_create_tty_driver(struct ice_pf *pf)
 	err = tty_register_driver(tty_driver);
 	if (err) {
 		dev_err(dev, "Failed to register TTY driver err=%d\n", err);
-
-		for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++) {
-			tty_port_destroy(pf->gnss_tty_port[i]);
-			kfree(pf->gnss_tty_port[i]);
-		}
-		kfree(ttydrv_name);
-		tty_driver_kref_put(pf->ice_gnss_tty_driver);
-
-		return NULL;
+		goto err_out;
 	}
 
 	for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++)
 		dev_info(dev, "%s%d registered\n", ttydrv_name, i);
 
 	return tty_driver;
+
+err_out:
+	while (i--) {
+		tty_port_destroy(pf->gnss_tty_port[i]);
+		kfree(pf->gnss_tty_port[i]);
+	}
+	kfree(ttydrv_name);
+	tty_driver_kref_put(pf->ice_gnss_tty_driver);
+
+	return NULL;
 }
 
 /**