Description of Problem:

If you have two identical groups in a group file and run grpconv on the
file, grpconv will run the system out of resources until the VM steps
in and kills grpconv.

Grant it, you should _never_ have two identical groups in a group file, but
shit does happen in the real world, especially when you are piecing a
system back together from backups.

Give me a core dump or an exit -1 rather than an infinite loop that brings
the system to its knees please.

How Reproducible:

'till the cows come home.

Steps to Reproduce:
1. edit the group file, duplicate an entry. Any entry should do.
2. run grpconv
3) Watch the system grind to a crawl. Try running top if you want.

Actual Results:


Expected Results:


Additional Information: