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Fixes up 4fab9071 ("tcp: fix tcp_release_cb() to dispatch via address
family for mtu_reduced()") backport which has swapped ipv4/ipv6 callbacks
for native IPv6 and mapped IPv4 sockets.

BugLink: http://bugs.launchpad.net/bugs/1404558

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Fixes: e86507f2

Signed-off-by: Kamal Mostafa <kamal@canonical.com>