The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.01.27.00.00.26 christos src/sys/kern/kern_sysctl.c,v 1.261 2018.01.27.00.21.41 christos src/sys/arch/x86/pci/files.pci,v 1.23 2018.01.27.00.23.19 christos src/sys/modules/amdzentemp/amdzentemp.ioconf,v 1.2 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.01.html#2018.01.27.00.23.19