Fix memory leaks in GenericCAO, ShaderSource and Player classes

src/content_cao.cpp

@@ -670,6 +670,7 @@ GenericCAO::~GenericCAO()
 	{
 		m_env->removePlayerName(m_name.c_str());
 	}
+	removeFromScene(true);
 }
 
 core::aabbox3d<f32>* GenericCAO::getSelectionBox()
@@ -735,7 +736,7 @@ ClientActiveObject* GenericCAO::getParent()
 
 void GenericCAO::removeFromScene(bool permanent)
 {
-	if(permanent) // Should be true when removing the object permanently and false when refreshing (eg: updating visuals)
+	if((m_env != 0) && (permanent)) // Should be true when removing the object permanently and false when refreshing (eg: updating visuals)
 	{
 		for(std::vector<u16>::iterator ci = m_children.begin();
 						ci != m_children.end(); ci++)

src/player.cpp

@@ -100,6 +100,7 @@ Player::Player(IGameDef *gamedef):
 
 Player::~Player()
 {
+	clearHud();
 }
 
 // Horizontal acceleration (X and Z), Y direction is ignored

src/shader.cpp

@@ -383,13 +383,16 @@ ShaderSource::ShaderSource(IrrlichtDevice *device):
 
 ShaderSource::~ShaderSource()
 {
-	//m_shader_callback->drop();
-
 	for (std::vector<IShaderConstantSetter*>::iterator iter = m_global_setters.begin();
 			iter != m_global_setters.end(); iter++) {
 		delete *iter;
 	}
 	m_global_setters.clear();
+
+	if (m_shader_callback) {
+		m_shader_callback->drop();
+		m_shader_callback = NULL;
+	}
 }
 
 u32 ShaderSource::getShader(const std::string &name,