Revert "Fix bug allowing the comparison of v4 and v6 prefixes."
Revert "Fix bug allowing the comparison of v4 and v6 prefixes."

That patch was fixing a little bug, but makes another bigger one.
The previous patch fixes both.

This reverts commit e687a58f01f2f1bcc344d8f9bacdfa5954dcae69.

jech/babeld,jech/babeld