By Alek Arend The NFL can be a brutal business at times. Just ask offensive lineman Fred Johnson. The Cincinnati Bengals officially announced on Tuesday that they signed offensive lineman Fred Johnson. However, 30 minutes later the team had a change of heart. The Bengals wound up waiving Johnson only 30 minutes after officially announcing the signing. We’re not so sure this has ever happened before. “A unique one: Bengals now waiving OL Fred Johnson, per source. Johnson recently signed his restricted free agent tender, but after signing OT La’el Collins, the Bengals have decided to waive Johns…