[mutter] events: Don't bother free-guarding

[Jasper St. Pierre <jstpierre src gnome org>]

commit b10a017446f7c8623283637159833eb4388ecabf
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sun Dec 28 19:46:25 2014 -0800

    events: Don't bother free-guarding
    
    free already takes NULL just fine.

 src/x11/events.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/src/x11/events.c b/src/x11/events.c
index 618692f..ca31153 100644
--- a/src/x11/events.c
+++ b/src/x11/events.c
@@ -657,9 +657,7 @@ meta_spew_event (MetaDisplay *display,
                          event->xany.serial);
 
   g_free (winname);
-
-  if (extra)
-    g_free (extra);
+  g_free (extra);
 
   return ret;
 }