Properly handle the three-way result from getgrnam and getpwnam.
Properly handle the three-way result from getgrnam and getpwnam.

If the group or user cannot be found, say so in the log, rather than list a
success.

lscube/feng,winlinvip/feng,lscube/feng,lscube/feng,winlinvip/feng,winlinvip/feng