[mutter/wip/multitouch: 47/73] display: Ignore events from slave devices

[Carlos Garnacho <carlosg src gnome org>]

commit 4e6e40de87b3549a1b6c5acf20a3e26f99cccf49
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 83eca61..5293780 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -1793,6 +1793,13 @@ 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)