Ticket #48048 - Fix coverity issues - 2015/3/1
Coverity defect 13034 - Explicit null dereferenced (FORWARD_NULL)
Description: Added NULL check for operation and sdn.
modified: update_pw_info in pw.c
https://fedorahosted.org/389/ticket/48048
Reviewed by rmeggins@redhat.com (Thank you, Rich!!)