more log cleanups

Hi all,

this series contains more uncontroversial patches from the
"cleanup log I/O error handling", series.

Follow-Ups:
- [PATCH 8/8] xfs: remove xlog_state_want_sync
  - From: Christoph Hellwig
- [PATCH 7/8] xfs: move the ioerror check out of xlog_state_clean_iclog
  - From: Christoph Hellwig
- [PATCH 6/8] xfs: refactor xlog_state_clean_iclog
  - From: Christoph Hellwig
- [PATCH 5/8] xfs: remove the aborted parameter to xlog_state_done_syncing
  - From: Christoph Hellwig
- [PATCH 4/8] xfs: simplify log shutdown checking in xfs_log_release_iclog
  - From: Christoph Hellwig
- [PATCH 3/8] xfs: simplify the xfs_log_release_iclog calling convention
  - From: Christoph Hellwig
- [PATCH 2/8] xfs: factor out a xlog_wait_on_iclog helper
  - From: Christoph Hellwig
- [PATCH 1/8] xfs: merge xlog_cil_push into xlog_cil_push_work
  - From: Christoph Hellwig