From bcb7e449ec6350121ac7ca138c0b050ba7caca47 Mon Sep 17 00:00:00 2001
From: Josef Bacik <jbacik@fb.com>
Date: Mon, 16 Mar 2015 17:38:02 -0400
Subject: [PATCH] Btrfs: just free dummy extent buffers

If we fail during our sanity tests we could get NULL deref's because we unload
the module before the dummy extent buffers are free'd via RCU.  So check for
this case and just free the things directly.  Thanks,

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