Description of problem: groupmems does not add or remove users propery

1) groupmems -g groupname -d username does not remove the user from the group.

2) groupmems -g groupname -a username gives a Segmentaion Fault Error when adding when adding an addition user to groups that have two or more users.

Version-Release number of selected component (if applicable):
shadow-utils-2:4.0.18.1-22.fc8.i386


How reproducible:

constistantly Reproducible


Steps to Reproduce:
1)groupmems -g groupname -d username does not remove the user from the group.
     A) if groupname contains users tom, dick, harry 
     B) # groupmems -g groupname -l   => tom, dick, harry
     C) # groupmens -g groupname -d dick   
     D) # groupmems -g groupname -l   => tom, dick, harry

2) groupmems -g groupname -a username gives a Segmentaion Fault Error when adding when adding an addition user to groups that have two or more users.

     A) if groupname contains users tom and you want to add users dick and harry
     B) # groupmens -g groupname -a dick
     C) # groupmems -g groupname -l   => tom, dick, 
     D) # groupmens -g groupname -a harry  => Segmentation Fault
    

Actual results:
See doc on steps to reproduce
Expected results:

See doc on steps to reproduce
Additional info: