fix [2303866] eglMakeCurrent doesn't return all error messages described in the spec

        if (cur_c == NULL) {

            // no current context

            if (draw != EGL_NO_SURFACE || read != EGL_NO_SURFACE) {

                // calling eglMakeCurrent( ..., EGL_NO_CONTEXT, !=0, !=0);

                return setError(EGL_BAD_PARAMETER, EGL_FALSE);

                // calling eglMakeCurrent( ..., !=0, !=0, EGL_NO_CONTEXT);

                return setError(EGL_BAD_MATCH, EGL_FALSE);

            }

            // not an error, there is just not current context.

            // not an error, there is just no current context.

            return EGL_TRUE;

        }

    }