The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2020.03.17.05.04.10 kre src/sys/arch/xen/xen/xennetback_xenbus.c,v 1.79 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2020.03.html#2020.03.17.05.04.10