Fix the path to the UFS/MSDOSFS filesystem labels, since they

cannot possibly exist within the chroot(8) before the target
filesystem actually exists.

MFC after:	3 days
X-MFC-With:	r285018
Sponsored by:	The FreeBSD Foundation

release/tools/arm.subr

@@ -70,8 +70,8 @@ arm_create_disk() {
 	#      Trust me.  I'm an engineer.
 	if [ ! -z "${EVERYTHINGISFINE}" ]; then
 		for _label in ufs/rootfs msdosfs/MSDOSBOOT; do
-			if [ -e "${CHROOTDIR}/dev/${_label}" ]; then
-				rm ${CHROOTDIR}/dev/${_label}
+			if [ -e "/dev/${_label}" ]; then
+				rm /dev/${_label}
 			fi
 		done
 	fi