batman-adv: Add missing hardif_free_ref in forw_packet_free
add_bcast_packet_to_list increases the refcount for if_incoming but the reference count is never decreased. The reference count must be increased for all kinds of forwarded packets which have the primary interface stored and forw_packet_free must decrease them. Also purge_outstanding_packets has to invoke forw_packet_free when a work item was really cancelled. This regression was introduced in 32ae9b22. Reported-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Sven Eckelmann <sven@narfation.org>
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