[mutter] ui: Fix the check for the XInput opcode

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

commit 909a46087f81c9c4451542aba13cc549cd700a8d
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Jul 8 12:58:17 2014 -0400

    ui: Fix the check for the XInput opcode
    
    When converting is_input_event to be the opposite, I forgot to make this
    change.

 src/ui/ui.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/ui/ui.c b/src/ui/ui.c
index 1acb70c..2c2166b 100644
--- a/src/ui/ui.c
+++ b/src/ui/ui.c
@@ -81,7 +81,7 @@ is_interesting_input_event (XEvent *event)
   XIEvent *input_event;
 
   if (event->type != GenericEvent ||
-      event->xcookie.extension == display->xinput_opcode)
+      event->xcookie.extension != display->xinput_opcode)
     return FALSE;
 
   input_event = (XIEvent *) event->xcookie.data;