[iptv][patch] dangling multicast streams
tvheadend doesn't leave some (random) multicast groups, when i switch iptv-channels. Therefore, over some time i have a lot of incoming parasite traffic (each stream eats approx. 2-2.5Mbit).
This patch fixes it (at least for me), by force sending "igmp_leave" packet at iptv_transport_stop(). Please revise and merge in main branch, if you find this patch useful.
P.S. Thanks for your great work. Good luck.