From 655b09fe540b73edeaabfb4c2d700be51a1f8bce Mon Sep 17 00:00:00 2001
From: Josef Bacik <jbacik@fusionio.com>
Date: Fri, 17 May 2013 14:06:51 -0400
Subject: [PATCH] Btrfs: make sure roots are assigned before freeing their
 nodes

If we fail to load the chunk tree we'll call free_root_pointers, except we may
not have assigned the roots for the dev_root/extent_root/csum_root yet, so we
could NULL pointer deref at this point.  Just add checks to make sure these
roots are set to keep us from panicing.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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