The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.02.28.13.12.53 ozaki-r src/sys/net/bridgestp.c,v 1.26 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.02.html#2018.02.28.13.12.53