render/egl: document that config may be zero
@@ -39,7 +39,7 @@ struct wlr_egl_context {
struct wlr_egl {
EGLenum platform;
EGLDisplay display;
- EGLConfig config;
+ EGLConfig config; // may be EGL_NO_CONFIG
EGLContext context;
EGLDeviceEXT device; // may be EGL_NO_DEVICE_EXT
