staging: lustre: lnet: Use list_entry() rather than container_of()

Use list_entry() rather than container_of() for nodes of doubly linked
lists.
Semantic patch used:

@a exists@
identifier var;
struct list_head *ptr;
@@

  var =
- container_of
+ list_entry
  (ptr, ...);

Signed-off-by: Janani Ravichandran <janani.rvchndrn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>