Merge patch series "fs: refactor code to use clear_and_wake_up_bit()"

Agatha Isabelle Moreira <code@agatha.dev> says:

Refactor code to use `clear_and_wake_up_bit()` instead of manual calls
to:
       	clear_bit_unlock();
	smp_mb__after_atomic();
	wake_up_bit();

The helper function `clear_and_wake_up_bit()` was introduced in
'commit 8236b0ae31c83 ("bdi: wake up concurrent wb_shutdown()
callers.")' as a generic way of doing the same sequence of operations,
but several pieces of code still remain.

Replace manual calls to the operations by a single call to
`clear_and_wake_up_bit()` to deduplicate code and standardize pathways.

* patches from https://patch.msgid.link/ag4PEP52c8rxrYPc@guidai:
  fs: jbd2: use clear_and_wake_up_bit() in journal_end_buffer_io_sync()
  fs: buffer: use clear_and_wake_up_bit() in unlock_buffer()

Link: https://patch.msgid.link/ag4PEP52c8rxrYPc@guidai
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>