[gnome-shell] shell-recorder: Avoid a crash when the cursor texture is NULL

[Rui Matos <rtcm src gnome org>]

commit 2a7f9f70b836aee8605876186ff75d001d8ce63d
Author: Rui Matos <tiagomatos gmail com>
Date:   Mon Jun 6 20:28:34 2016 +0200

    shell-recorder: Avoid a crash when the cursor texture is NULL
    
    When running as a wayland compositor, MetaCursorTracker might
    legitimately not have a displayed cursor because e.g. a client unsets
    the cursor surface.
    
    Note that, under an X session, the assumption that the tracker always
    has a cursor texture is true because XFixesGetCursorImage() always
    returns data even if the cursor isn't visible.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=767001

 src/shell-recorder.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/shell-recorder.c b/src/shell-recorder.c
index ef729ff..e7562ef 100644
--- a/src/shell-recorder.c
+++ b/src/shell-recorder.c
@@ -321,6 +321,9 @@ recorder_fetch_cursor_image (ShellRecorder *recorder)
   guint8 *data;
 
   texture = meta_cursor_tracker_get_sprite (recorder->cursor_tracker);
+  if (!texture)
+    return;
+
   width = cogl_texture_get_width (texture);
   height = cogl_texture_get_height (texture);
   stride = 4 * width;