bin/47089: mv mount point returns No such file or directory

[mspo%netbsd.org@localhost]

>Number:         47089
>Category:       bin
>Synopsis:       mv mount point returns No such file or directory
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 18 04:25:00 +0000 2012
>Originator:     matthew sporleder
>Release:        6.0
>Organization:
mspo.com
>Environment:
NetBSD vc136-15.vc.panix.com 6.0 NetBSD 6.0 (PANIX-VC) #0: Sun Oct 14 18:53:46 
EDT 2012  
root%juggler.panix.com@localhost:/misc/obj/misc/devel/netbsd/6.0/src/sys/arch/amd64/compile/PANIX-VC
 amd64
>Description:
Filesystem         Size       Used      Avail %Cap Mounted on
/dev/xbd0a         7.3G       4.8G       2.1G  70% /
/dev/xbd2a         1.9G       1.6G       214M  88% /usr/pkg


vc136-15tmp # cd /var
vc136-15var # mv /usr/pkg /var/
mv: rename /usr/pkg to /var/pkg: No such file or directory

---
I don't necessarily agree that mv should just bail out, but I guess it's tough 
to define what to do with a mount point, specifically.

Anyway, the errno is definitely wrong.
>How-To-Repeat:

>Fix: