Backported two fixes from https://github.com/dbluelle/pandora-extremetuxracer/:

- avoid crash on empty opengl error message (329095daebd3fc1c7d8639dd63a10089a51515c5)
- fix warnings (7a8c9837e586ec02ff9034443d5c2500607a5a72)

git-svn-id: https://svn.code.sf.net/p/extremetuxracer/code/trunk@386 0420edf4-82e4-42fc-9478-35b55e6d67a3

newplayer.cpp

@@ -54,6 +54,8 @@ void CNewPlayer::Keyb_spec (SDL_keysym sym, bool release) {
 			if (textbuttons[0]->focussed()) State::manager.RequestEnterState (Regist);
 			else QuitAndAddPlayer ();
 			break;
+		default:
+			break;
 	}
 }
 

ogl.cpp

@@ -46,8 +46,9 @@ static const gl_value_t gl_values[] = {
 
 void check_gl_error() {
     GLenum error = glGetError();
-    if (error != GL_NO_ERROR) {
-		Message ("OpenGL Error: ", "");
+    if (error != GL_NO_ERROR) {
+		const char* errstr = (const char*)gluErrorString(error);
+		Message ("OpenGL Error: ", errstr ? errstr : "");
     }
 }