can: dev: prevent potential information leak in can_fill_info()

The "bec" struct isn't necessarily always initialized. For example, the
mcp251xfd_get_berr_counter() function doesn't initialize anything if the
interface is down.

Fixes: 52c793f2 ("can: netlink support for bus-error reporting and counters")
Link: https://lore.kernel.org/r/YAkaRdRJncsJO8Ve@mwandaSigned-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/dev.c

@@ -1163,7 +1163,7 @@ static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
 {
 	struct can_priv *priv = netdev_priv(dev);
 	struct can_ctrlmode cm = {.flags = priv->ctrlmode};
-	struct can_berr_counter bec;
+	struct can_berr_counter bec = { };
 	enum can_state state = priv->state;
 
 	if (priv->do_get_state)