We need to pass NGROUPS + 1 to getgrouplist(3) to display

NGROUPS groups.  getgrouplist(3) may put a duplicate group
id into the passed array (it sets [0] and [1] to the value
of the gid argument), but id_print() sorts them out.

usr.bin/id/id.c

@@ -243,7 +243,7 @@ id_print(struct passwd *pw, int p_euid, int p_egid)
 	uid = pw->pw_uid;
 	gid = pw->pw_gid;
 
-	ngroups = NGROUPS;
+	ngroups = NGROUPS + 1;
 	getgrouplist(pw->pw_name, gid, groups, &ngroups);
 
 	printf("uid=%u(%s)", uid, pw->pw_name);