The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2016.12.10.08.48.11 kre src/lib/libnpf/npf.c,v 1.37 2016.12.10.09.26.16 kre src/sys/net/npf/npf_conn.c,v 1.19 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2016.12.html#2016.12.10.09.26.16