[gnome-builder] egg-counter: check g_module_symbol() result

[Christian Hergert <chergert src gnome org>]

commit f7ae5b09f4fafd802968491e0f1207fd25783bfb
Author: Christian Hergert <christian hergert me>
Date:   Mon Apr 18 19:15:49 2016 -0700

    egg-counter: check g_module_symbol() result
    
    I don't expect it to put garbage in sym, but best to be safe.

 contrib/egg/egg-counter.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/contrib/egg/egg-counter.c b/contrib/egg/egg-counter.c
index e730eba..19a44e4 100644
--- a/contrib/egg/egg-counter.c
+++ b/contrib/egg/egg-counter.c
@@ -555,8 +555,7 @@ _egg_counter_find_getcpu_in_vdso (void)
         {
           void *sym = NULL;
 
-          g_module_symbol (lib, sym_names [j], &sym);
-          if (!sym)
+          if (!g_module_symbol (lib, sym_names [j], &sym) || (sym == NULL))
             continue;
 
           return sym;