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All callers are passing end_buffer_async_write as this argument, so we can
hardcode references to it within __block_write_full_folio().  That lets us
make end_buffer_async_write() static.

Link: https://lkml.kernel.org/r/20231215200245.748418-15-willy@infradead.org

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>