Merge series 'Fixes and cleanups to fs-writeback' of https://lore.kernel.org/r/202402...

Pull writeback fixes and cleanups from Kemeng Shi:

This contains several fixes and cleanups for the writeback code.

* series 'Fixes and cleanups to fs-writeback' of https://lore.kernel.org/r/20240228091958.288260-1-shikemeng@huaweicloud.com: (6 commits)
  fs/writeback: remove unnecessary return in writeback_inodes_sb
  fs/writeback: correct comment of __wakeup_flusher_threads_bdi
  fs/writeback: only calculate dirtied_before when b_io is empty
  fs/writeback: remove unused parameter wb of finish_writeback_work
  fs/writeback: bail out if there is no more inodes for IO and queued once
  fs/writeback: avoid to writeback non-expired inode in kupdate writeback

Signed-off-by: Christian Brauner <brauner@kernel.org>