Add a missing include of opt_sctp.h.

MFC after:	1 week
Sponsored by:	The FreeBSD Foundation

sys/modules/pf/Makefile

@@ -6,7 +6,7 @@ KMOD=	pf
 SRCS=	pf.c pf_if.c pf_lb.c pf_osfp.c pf_ioctl.c pf_norm.c pf_table.c \
 	pf_ruleset.c in4_cksum.c \
 	bus_if.h device_if.h \
-	opt_pf.h opt_inet.h opt_inet6.h opt_bpf.h opt_global.h
+	opt_pf.h opt_inet.h opt_inet6.h opt_bpf.h opt_sctp.h opt_global.h
 
 .if !defined(KERNBUILDDIR)
 # pflog can be loaded as a module, have the additional checks turned on

sys/netpfil/pf/pf.c

@@ -44,6 +44,7 @@ __FBSDID("$FreeBSD$");
 #include "opt_inet6.h"
 #include "opt_bpf.h"
 #include "opt_pf.h"
+#include "opt_sctp.h"
 
 #include <sys/param.h>
 #include <sys/bus.h>