[B.A.T.M.A.N.] [PATCH] batman-adv: Modifing hna_local_fill_buffer() return value

[Antonio Quartulli]

After changeset 1888, the return value of hna_local_fill_buffer() has
not been changed to _count_. In this way an eroneous num_hna was
calculated before sending the new OGM packet.