Fix compilation warning of passing NULL to int parameter

* util.cxx (in_group_id): Replace NULL with 0.

1 files changed, 1 insertions, 1 deletions

diff --git a/util.cxx b/util.cxx
index da8fc944..bffeb04e 100644
--- a/util.cxx
+++ b/util.cxx
@@ -200,7 +200,7 @@ in_group_id (gid_t target_gid)
     return true;
 
   // Get the list of the user's groups.
-  int ngids = getgroups(NULL, 0); // Returns the number to allocate.
+  int ngids = getgroups(0, 0); // Returns the number to allocate.
   if (ngids > 0) {
     gid_t gidlist[ngids];
     ngids = getgroups(ngids, gidlist);