Emscripten: Fixed opening previously closed joystick.
diff --git a/src/joystick/emscripten/SDL_sysjoystick.c b/src/joystick/emscripten/SDL_sysjoystick.c
index e0c5833..c3becd2 100644
--- a/src/joystick/emscripten/SDL_sysjoystick.c
+++ b/src/joystick/emscripten/SDL_sysjoystick.c
@@ -377,6 +377,8 @@
 void
 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
 {
+    SDL_joylist_item *item = (SDL_joylist_item *) joystick->hwdata;
+    item->joystick = NULL;
 }
 
 /* Function to perform any system-specific joystick related cleanup */