extcon: cros-ec: Fix a potential NULL pointer dereference

Return -ENOMEM in case of memory allocation failure. This avoids a NULL
pointer dereference.

Fixes: c698316661 ("extcon: cros-ec: Add extcon-cros-ec driver to support display out")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/extcon/extcon-usbc-cros-ec.c

@@ -68,6 +68,8 @@ static int cros_ec_pd_command(struct cros_ec_extcon_info *info,
 	int ret;
 
 	msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
 
 	msg->version = version;
 	msg->command = command;