Fix count value to 0 if extension is unsupported or context is gone. Fixes a bug found by hendu.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3695 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COpenGLExtensionHandler.h

@@ -1506,6 +1506,7 @@ inline void COpenGLExtensionHandler::extGlDeleteShader(GLuint shader)
 
 inline void COpenGLExtensionHandler::extGlGetAttachedObjects(GLhandleARB program, GLsizei maxcount, GLsizei* count, GLhandleARB* shaders)
 {
+	*count=0;
 #ifdef _IRR_OPENGL_USE_EXTPOINTER_
 	if (pGlGetAttachedObjectsARB)
 		pGlGetAttachedObjectsARB(program, maxcount, count, shaders);
@@ -1518,6 +1519,7 @@ inline void COpenGLExtensionHandler::extGlGetAttachedObjects(GLhandleARB program
 
 inline void COpenGLExtensionHandler::extGlGetAttachedShaders(GLuint program, GLsizei maxcount, GLsizei* count, GLuint* shaders)
 {
+	*count=0;
 #ifdef _IRR_OPENGL_USE_EXTPOINTER_
 	if (pGlGetAttachedShaders)
 		pGlGetAttachedShaders(program, maxcount, count, shaders);