Btrfs: fix memory leak in do_walk_down
commit a958eab0 upstream. The extent buffer 'next' needs to be free'd conditionally. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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