Fixed one clang compiler warning

git-svn-id: https://svn.code.sf.net/p/extremetuxracer/code/trunk@678 0420edf4-82e4-42fc-9478-35b55e6d67a3

src/states.cpp

@@ -107,6 +107,9 @@ void State::Manager::PollEvent() {
 				case sf::Event::Closed:
 					quit = true;
 					break;
+
+				default:
+					break;
 			}
 		}
 	}