Apply "format security" warning/error fix from Ilya Barygin. I don't think it will actually cause a security issue in this context and i'm not sure if it will cause a FTBFS in debian (apparently it didn't back in 2011) but it's certainly horrible coding practice to pass a string that is not explicitly intended to be a format string to the first parameter of a printf so may as well fix it. (Closes: #646327)
