[mutter/wip/multitouchr: 48/73] display: Ignore events from slave devices

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

commit f512da8c4712369c0496ebd3364294228156ee1c
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat Jul 9 18:45:35 2011 +0200

    display: Ignore events from slave devices
    
    Mutter only handles master devices.

 src/core/display.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/core/display.c b/src/core/display.c
index cbe37d4..7dfa3b3 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -2020,6 +2020,13 @@ event_callback (XEvent   *event,
         }
 
       device = meta_input_event_get_device (display, event);
+
+      /* Ignore unknown devices, most likely
+       * slave devices we don't care about
+       */
+      if (!device)
+        return FALSE;
+
       grab_info = meta_display_get_grab_info (display, device);
 
       switch (evtype)