segfault on `alter role` as `privileged_role`

[Bobbie Soedirgo]

Bug report

Describe the bug

Segfault when doing alter role without a bypassrls clause.

To Reproduce

Steps to reproduce the behavior, please provide code snippets or a repository:

1. login as privileged_role
2. run create role tmp;
3. run alter role tmp;
4. segfaults

Expected behavior

No segfault