Tested on x86_64. build-many-glibcs run in progress.
--
addinnetgrX may use the heap-allocated buffer, so free the buffer
in this function.

(cherry picked from commit 745664bd798ec8fd50438605948eea594179fba1)
---
 ChangeLog            | 12 ++++++++++++
 nscd/netgroupcache.c | 42 +++++++++++++++++++++++++++++-------------
 2 files changed, 41 insertions(+), 13 deletions(-)

-- 
Cheers,
Carlos.