Don't print "unrecognized key" message for an X11 keycode of 0. This can happen with composed characters.
diff --git a/src/video/x11/SDL_x11events.c b/src/video/x11/SDL_x11events.c
index a9a3ac9..4bdfd1c 100644
--- a/src/video/x11/SDL_x11events.c
+++ b/src/video/x11/SDL_x11events.c
@@ -440,7 +440,7 @@ X11_DispatchEvent(_THIS)
#endif
SDL_SendKeyboardKey(SDL_PRESSED, videodata->key_layout[keycode]);
#if 1
- if (videodata->key_layout[keycode] == SDL_SCANCODE_UNKNOWN) {
+ if (videodata->key_layout[keycode] == SDL_SCANCODE_UNKNOWN && keycode) {
int min_keycode, max_keycode;
XDisplayKeycodes(display, &min_keycode, &max_keycode);
#if SDL_VIDEO_DRIVER_X11_HAS_XKBKEYCODETOKEYSYM