btrfs: tree-log: factor out a clean_log_buffer helper
The tree-log code has three almost identical copies for the accounting on an extent_buffer that doesn't need to be written any more. The only difference is that walk_down_log_tree passed the bytenr used to find the buffer instead of extent_buffer.start and calculates the length using the nodesize, while the other two callers look at the extent_buffer.len field that must always be equivalent to the nodesize. Factor the code into a common helper. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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