ki_fd is legitimately NULL when 32bit process requests process data
from 64bit host kernel.  The field is not used by the code for sysctl
case;  procstat_getfiles_kvm() checks ki_fd.

PR:	260174
Reported by:	Damjan Jovanovic <damjan.jov@gmail.com>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week