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The value of variable 'can_recover' is never used after being set, thus
it should be removed, as it was never used since the first commit
68a7342c

 ("Btrfs: cleanup orphaned root orphan item").
Signed-off-by: Christos Gkekas <chris.gekas@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>