Bug 204011: fixed the bug that nssPKIObjectCollection_AddInstances frees an instance twice if add_object_instance fails.  r=mcgreer.
Bug 204011: fixed the bug that nssPKIObjectCollection_AddInstances frees an
instance twice if add_object_instance fails.  r=mcgreer.

nmav/nss,nmav/nss,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,ekr/nss-old,nmav/nss,ekr/nss-old,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,ekr/nss-old