The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2016.08.04.03.16.00 nonaka src/sys/lib/libsa/ext2fs.c,v 1.22 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2016.08.html#2016.08.04.03.16.00