4.19-stable patches

4.19-stable patches

added patches:
	can-slip-protect-tty-disc_data-in-write_wakeup-and-close-with-rcu.patch
	firestream-fix-memory-leaks.patch
	gtp-make-sure-only-sock_dgram-udp-sockets-are-accepted.patch
	ipv6-sr-remove-skb_gso_ipxip6-on-end.d-actions.patch
	net-bcmgenet-use-netif_tx_napi_add-for-tx-napi.patch
	net-cxgb3_main-add-cap_net_admin-check-to-chelsio_get_mem.patch
	net-ip6_gre-fix-moving-ip6gre-between-namespaces.patch
	net-ip6_tunnel-fix-namespaces-move.patch
	net-ip_tunnel-fix-namespaces-move.patch
	net-rtnetlink-validate-ifla_mtu-attribute-in-rtnl_create_link.patch
	net-sysfs-fix-reference-count-leak.patch
	net-usb-lan78xx-add-.ndo_features_check.patch
	net_sched-fix-datalen-for-ematch.patch
	revert-udp-do-rmem-bulk-free-even-if-the-rx-sk-queue-is-empty.patch
	tcp-do-not-leave-dangling-pointers-in-tp-highest_sack.patch
	tcp_bbr-improve-arithmetic-division-in-bbr_update_bw.patch
	tun-add-mutex_unlock-call-and-napi.skb-clearing-in-tun_get_user.patch