[PATCH AUTOSEL for 4.4 057/162] dccp: call inet_add_protocol after register_pernet_subsys in dccp_v4_init

From: Xin Long [ Upstream commit d5494acb88aa9dd1325079c9b8855008a52c19b3 ] Now dccp_ipv4 works as a kernel module. During loading this module, if one dccp packet is being recieved after inet_add_protocol but before register_pernet_subsys in which v4_ctl_sk is initialized,

[PATCH AUTOSEL for 4.4 057/162] dccp: call inet_add_protocol after register_pernet_subsys in dccp_v4_init

From: Xin Long [ Upstream commit d5494acb88aa9dd1325079c9b8855008a52c19b3 ] Now dccp_ipv4 works as a kernel module. During loading this module, if one dccp packet is being recieved after inet_add_protocol but before register_pernet_subsys in which v4_ctl_sk is initialized, a null pointer