start_stop_daemon: set complementary group ids too. Closes 3253

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/inetd.c b/networking/inetd.c
index fc6847b..26b6699 100644
--- a/networking/inetd.c
+++ b/networking/inetd.c
@@ -1414,7 +1414,7 @@
 				bb_error_msg("non-root must run services as himself");
 				goto do_exit1;
 			}
-			if (pwd->pw_uid) {
+			if (pwd->pw_uid != 0) {
 				if (sep->se_group)
 					pwd->pw_gid = grp->gr_gid;
 				/* initgroups, setgid, setuid: */