Ryan Guzman has answered the call for 9-1-1. The Boy Next Door actor is joining Fox’s first-responders drama as a series regular for Season 2, the network said today. Guzman will play a firefighter who joins the firehouse led by Capt. Bobby Nash (Peter Krause). Created by Ryan Murphy, Brad Falchuk and Tim Minear, the procedural explores the high-pressure experiences of police officers, paramedics and firefighters who are thrust into the most frightening, shocking and…