IPoIB: Fix memory leak of multicast group structures
The current handling of multicast groups in IPoIB ends up never freeing send-only multicast groups. It turns out the logic was much more complicated than it needed to be; we can fix this bug and completely kill ipoib_mcast_dev_down() at the same time. Signed-off-by: Eli Cohen <eli@mellanox.co.il> Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
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