sctp: remove the typedef sctp_unrecognized_param_t

This patch is to remove the typedef sctp_unrecognized_param_t, and
replace with struct sctp_unrecognized_param in the places where it's
using this typedef.

It is also to fix some indents in sctp_sf_do_unexpected_init() and
sctp_sf_do_5_1B_init().

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>