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Provide function description for flush_dir(). Move all error messages for flush_dir() from the callers to the function. Move mapping of errors to -EIO to the function. Always check return value of flush_dir() (Coverity CID 316362). In fat_unlink() return -EIO if flush_dirty_fat_buffer() fails. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>