Quiet down malloc hook

Change-Id: I30c81952b1525e550d9c4a79fe4c17da94887769
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/aos/realtime.cc b/aos/realtime.cc
index 8b34ada..94dfa4e 100644
--- a/aos/realtime.cc
+++ b/aos/realtime.cc
@@ -331,7 +331,9 @@
   if (FLAGS_die_on_malloc) {
     // tcmalloc redefines __libc_malloc, so use this as a feature test.
     if (&__libc_malloc == &tc_malloc) {
-      RAW_LOG(INFO, "Hooking tcmalloc for die_on_malloc");
+      if (VLOG_IS_ON(1)) {
+        RAW_LOG(INFO, "Hooking tcmalloc for die_on_malloc");
+      }
       if (&MallocHook_AddNewHook != nullptr) {
         CHECK(MallocHook_AddNewHook(&NewHook));
       } else {