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Josef Bacik authored
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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