batman-adv: Add missing hardif_free_ref in forw_packet_free

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
1163fa2e14fd11aa7cf7d65df9ebf1c43de159b1.

Reported-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Sven Eckelmann <sven@narfation.org>