Remove duplicated code in `lib/gitlab/checks/change_access.rb`

See https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/564#note_13734711

@timothyandrew I'm assigning you, don't hesitate to re-assign but I think this is pretty urgent to do it.

mentioned in merge request !564 (merged)

@rymai I won't be able to get to this until Monday. Does that sound ok?

@timothyandrew I think that's totally acceptable yes (heads up: I'll be on holidays)!

Milestone changed to %8.11

done by https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/647

mentioned in merge request !647 (merged)

Thanks, @vsizov! I was stuck with !581 (merged) and gitlab-org/gitlab-ce!5824 today, so I'm only just getting around to it. I'll re-assign this issue to you.

Reassigned to @vsizov

I'm not the author, I just posted the link :)

Status changed to closed by merge request !647 (merged)