Coverity analysis defect 120117: Unsafe assignment operator

Unsafe assignment operator

This user-written assignment operator does not check for self-assignment. If an object of this type is assigned to itself use-after-free errors may occur if the class owns resources. Assignment operator does not check for self-assignment
/src/mongo/db/storage/bson_collection_catalog_entry.h:77: SELF_ASSIGN 120117 No protection against the object assigning to itself.