remove output from clock observer

libafl_qemu/src/clock.rs

@@ -122,7 +122,6 @@ where
 
     fn post_exec(&mut self, _state: &mut S, _input: &I) -> Result<(), Error> {
         unsafe { self.last_runtime = emu::libafl_get_clock() };
-        #[cfg(debug_assertions)] println!("Observer Clock: {}",self.last_runtime());
         Ok(())
     }
 }