[gtk+] gdk: return 0, not NULL from gdk_device_get_n_axes()

[Michael Natterer <mitch src gnome org>]

commit 13f18567e98e3c26e125ee458ca318fef6acb281
Author: Michael Natterer <mitch gimp org>
Date:   Tue Dec 21 15:16:35 2010 +0100

    gdk: return 0, not NULL from gdk_device_get_n_axes()

 gdk/gdkdevice.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkdevice.c b/gdk/gdkdevice.c
index 8e6feec..f7269f3 100644
--- a/gdk/gdkdevice.c
+++ b/gdk/gdkdevice.c
@@ -972,7 +972,7 @@ gint
 gdk_device_get_n_axes (GdkDevice *device)
 {
   g_return_val_if_fail (GDK_IS_DEVICE (device), 0);
-  g_return_val_if_fail (gdk_device_get_source (device) != GDK_SOURCE_KEYBOARD, NULL);
+  g_return_val_if_fail (gdk_device_get_source (device) != GDK_SOURCE_KEYBOARD, 0);
 
   return device->priv->axes->len;
 }