Broken regression Makefile

[Thomas Klausner <wiz%NetBSD.org@localhost>]

While doing a build of -current/amd64 on amd64, I found:

cleandir ===> regress/sys/kern/umount
***  Cleaning up /usr/src/regress/sys/kern/umount/obj.amd64/umount-f_mount, 
/usr/src/regress/sys/kern/umount/obj.amd64/umount-f.im.
umount -f "/usr/src/regress/sys/kern/umount/obj.amd64/umount-f_mount"
umount: /usr/src/regress/sys/kern/umount/obj.amd64/umount-f_mount: not 
currently mounted

*** Failed target:  clean
*** Failed command: umount -f 
"/usr/src/regress/sys/kern/umount/obj.amd64/umount-f_mount"
*** Error code 1 (ignored)
vnconfig -u "vnd0"
vnconfig: /dev/rvnd0d: VNDIOCCLR: Device not configured

*** Failed target:  clean
*** Failed command: vnconfig -u "vnd0"
*** Error code 1 (ignored)

I don't think this should run during a normal build.
What if I had had vnd0 configured?
 Thomas