inet: fix ip_mc_drop_socket()
commit 8723e1b4 (inet: RCU changes in inetdev_by_index()) forgot one call site in ip_mc_drop_socket() We should not decrease idev refcount after inetdev_by_index() call, since refcount is not increased anymore. Reported-by: NMarkus Trippelsdorf <markus@trippelsdorf.de> Reported-by: NMiles Lane <miles.lane@gmail.com> Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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