Staging: lustre: statahead: Remove sa_first_received_entry wrapper

Remove the function sa_first_received_entry() and replace all its calls
with the function list_entry() that it wraps.

Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>