Merge tag '6.13-rc4-SMB3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:

 - fix caching of files that will be reused for write

 - minor cleanup

* tag '6.13-rc4-SMB3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Remove unused is_server_using_iface()
  smb: enable reuse of deferred file handles for write operations