*: add optimization barrier to all "G trick" locations

diff --git a/networking/traceroute.c b/networking/traceroute.c
index 2ba558f..582840a 100644
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -378,7 +378,7 @@
 #define wherefrom (G.wherefrom)
 #define gwlist    (G.gwlist   )
 #define INIT_G() do { \
-	PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
+	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 	maxpacket = 32 * 1024; \
 	port = 32768 + 666; \
 	waittime = 5; \