Merge tag 'afs-fixes-20210721' of git://

Pull AFS fixes from David Howells:

 - Fix a tracepoint that causes one of the tracing subsystem query files
   to crash if the module is loaded

 - Fix afs_writepages() to take account of whether the storage rpc
   actually succeeded when updating the cyclic writeback counter

 - Fix some error code propagation/handling

 - Fix place where afs_writepages() was setting writeback_index to a
   file position rather than a page index

* tag 'afs-fixes-20210721' of git://
  afs: Remove redundant assignment to ret
  afs: Fix setting of writeback_index
  afs: check function return
  afs: Fix tracepoint string placement with built-in AFS