It turns out Smith was the voice of one of the Stormtroopers who attacked Maz Kanata's Castle on Takodana. His one line, said after the arrival of the Resistance, was, "We have incoming at 28.6! Move!"
Smith is, of course, the director/actor/podcaster/professional fanboy behind Clerks and Fatman on Batman, among many other works.
You can check out the full list of notable "additional voices" from the film over at StarWars.com, including some recognizable voices from Star Wars: The Clone Wars - supervising sound editor Matthew Wood worked on both projects, after all.
Star Wars: The Force Awakens is now in theaters.