fixed a segv

diff --git a/listgroups.c b/listgroups.c
index e96535fe1a438670ddb3ca09bc7e083c7f1644fd..403ac85baf9087c053e75ccbbed3382b459f4958 100644 (file)
--- a/listgroups.c
+++ b/listgroups.c
@@ -20,7 +20,7 @@ int main(void)
 
        for (i=0;i<ngroups;i++) {
                grp = getgrgid(grps[i]);
-               printf("%5d %s\n", grps[i], grp->gr_name);
+               printf("%5d %s\n", grps[i], grp?grp->gr_name:"<NULL>");
        }
        return 0;
 }