From 2009: Like a bad rash, Mr. Media is making his way through the entire squad room of the new NBC TV drama, “Southland.” Regular listeners will recall that last spring, at the end of the show’s first season, Regina King, Michael Cudlitz and Shawn Hatosy all scratch their media itch right here. And now I’m delighted to welcome Michael McGrady, who plays Detective Daniel “Sal” Salinger.