Literary agent and film literary agent? Do I need both?

Hey there,

My manuscript is being picked up by a publisher and should be out in April 2016. I coincidentally studied like a crazy person and turned my manuscript into a screenplay with a cool twist it only varies slightly from the original manuscript.

I have a literary agent, but do I need a film literary agent as well?

Thank you,

Keston

Literary agent and film literary agent? Do I need both?