[Pkg-shadow-devel] Bug#1122913: passwd: groupmod -U "" groupname segfaults

[Chris Hofstaedtler]

As noted in the upstream report, this is a working repro:

groupadd delme
useradd x1
useradd x2
useradd x3
groupmod -U x1,x2,x3 delme
groupmod -U x1,x2 delme