The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2017.12.22.14.41.55 jakllsch src/sys/dev/usb/uslsa.c,v 1.25 2017.12.22.15.02.57 kamil src/sys/kern/sys_ptrace_common.c,v 1.30 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2017.12.html#2017.12.22.15.02.57