can: raw: Remove NULL check before dev_{put, hold}

The call netdev_{put, hold} of dev_{put, hold} will check NULL, so there
is no need to check before using dev_{put, hold}, remove it to silence
the warning:

./net/can/raw.c:497:2-9: WARNING: NULL check before dev_{put, hold} functions is not needed.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=6231Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Reported-by: Simon Horman <horms@kernel.org>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/all/20230825064656.87751-1-jiapeng.chong@linux.alibaba.comSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

net/can/raw.c

@@ -493,8 +493,7 @@ static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
 
 out_put_dev:
 	/* remove potential reference from dev_get_by_index() */
-	if (dev)
-		dev_put(dev);
+	dev_put(dev);
 out:
 	release_sock(sk);
 	rtnl_unlock();