From RLJE Films and Shudder, this unexpected horror dramedy makes dirty cops even more demonic. Justin Long has quietly become one of indie horror’s most reliable trust indicators . From “Tusk” to “Barbarian,” he’s a familiar face whose presence on screen typically signals genre storytellers with something truly worthwhile to say. But in Ryan Prows’ “ Night Patrol ,” arriving in theaters from RLJE Films and Shudder , the actor barely registers. That’s an ironic testament to Prows’ clear