modules/sctp - Fixes FreeBSD compile error and 2 warnings

[mslehto]

This patch makes SCTP module compile without errors or warnings on FreeBSD 10.1

CC (clang) [M sctp.so]          sctp_server.o
sctp_server.c:2400:54: error: too few arguments provided to function-like macro invocation
                        SCTP_EV_REMOTE_ERROR(&si->address, si->port_no, su);
                                                                          ^
./sctp_ev.h:37:9: note: macro 'SCTP_EV_REMOTE_ERROR' defined here
#define SCTP_EV_REMOTE_ERROR(lip, lport, src, err)
        ^
sctp_server.c:2400:4: error: use of undeclared identifier 'SCTP_EV_REMOTE_ERROR'
                        SCTP_EV_REMOTE_ERROR(&si->address, si->port_no, su);
                        ^
sctp_server.c:2662:13: warning: equality comparison with extraneous parentheses [-Wparentheses-equality]
                if ((errno==ENOENT)){

sctp_server.c:2829:13: warning: equality comparison with extraneous parentheses [-Wparentheses-equality]
                if ((errno==ENOENT)){

[miconda]

I pushed the patch manually, with you as author -- the commit message was not appropriate for the changelog style, changed that to something more human friendly.