Remove dangling node pointer in pqueues.
Remove dangling node pointer in pqueues.

Change-Id: Ic4852c3e0ba9a3fc4f489238a2b63eef5eca6fa2
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/456
Tested-by: Jenkins Server
Reviewed-by: Nicholas E. Bofferding <fb8db48116bc8a69e29dd8cdb037246f232f4af5@us.ibm.com>
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>

alvintpwang/hostboot,open-power/hostboot,alvintpwang/hostboot,csmart/hostboot,open-power/hostboot,csmart/hostboot,alvintpwang/hostboot,open-power/hostboot,alvintpwang/hostboot,Over-enthusiastic/hostboot,alvintpwang/hostboot,Over-enthusiastic/hostboot,open-power/hostboot,csmart/hostboot,csmart/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot