[gnome-settings-daemon] common: Return -1 on error getting the stylus ID

[Bastien Nocera <hadess src gnome org>]

commit 4c3529857413973e7a6c9deb325f88eb50467ff3
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Jan 31 16:00:23 2012 +0000

    common: Return -1 on error getting the stylus ID
    
    Rather than 0x0, so we can differentiate the lack of stylus ID to
    an erro getting the stylus ID.

 plugins/common/gsd-input-helper.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/plugins/common/gsd-input-helper.c b/plugins/common/gsd-input-helper.c
index 4c14657..630fdde 100644
--- a/plugins/common/gsd-input-helper.c
+++ b/plugins/common/gsd-input-helper.c
@@ -302,13 +302,13 @@ xdevice_get_last_tool_id (int deviceid)
         unsigned char *data, *ptr;
         int            id;
 
-        id = 0x0;
+        id = -1;
 
         gdk_display_sync (gdk_display_get_default ());
 
         prop = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), WACOM_SERIAL_IDS_PROP, False);
         if (!prop)
-                return id;
+                return -1;
 
         gdk_error_trap_push ();
 
@@ -317,7 +317,7 @@ xdevice_get_last_tool_id (int deviceid)
                             AnyPropertyType, &act_type, &act_format,
                             &nitems, &bytes_after, &data) == Success) {
                 gdk_error_trap_pop_ignored ();
-                return 0x0;
+                return -1;
         }
 
         if (gdk_error_trap_pop ())