bin/48182: rmdir -p doesn't handle top-level directories well

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

>Number:         48182
>Category:       bin
>Synopsis:       rmdir -p doesn't handle top-level directories well
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 04 20:20:00 +0000 2013
>Originator:     Thomas Klausner
>Release:        NetBSD 6.99.23
>Organization:
Curiosity is the very basis of education and if you tell me that 
curiosity killed the cat, I say only that the cat died nobly.
- Arnold Edinborough
>Environment:
        
        
System: NetBSD yt.nih.at 6.99.23 NetBSD 6.99.23 (KVOTHE) #4: Tue Sep 3 20:41:53 
CEST 2013 
wiz%yt.nih.at@localhost:/archive/foreign/src/sys/arch/amd64/compile/obj/KVOTHE 
amd64
Architecture: x86_64
Machine: amd64
>Description:

# mkdir /a
# rmdir -p /a
rmdir: : No such file or directory
>How-To-Repeat:
See above.
>Fix:
Probably easy, but wanted to document it first while I still remember it.

>Unformatted: