sunrpc: fix memory leak in unix_gid cache.

When we look up an entry in the uid->gidlist cache, we take
a reference to the content but don't drop the reference to the
cache entry.  So it never gets freed.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
index 5c865e2..799ff6e 100644
--- a/net/sunrpc/svcauth_unix.c
+++ b/net/sunrpc/svcauth_unix.c
@@ -658,6 +658,7 @@
 	case 0:
 		*gip = ug->gi;
 		get_group_info(*gip);
+		cache_put(&ug->h, &unix_gid_cache);
 		return 0;
 	default:
 		return -EAGAIN;