SDL: emscripten: Fixed unregistering of key event handlers

SDL Commits
1 
From 8a648dfd9b06af54e5580ad725c38e979e7dde17 Mon Sep 17 00:00:00 2001
From: Chen Steenvoorden <[EMAIL REDACTED]>
Date: Fri, 14 Feb 2025 16:51:04 +0100
Subject: [PATCH] emscripten: Fixed unregistering of key event handlers

---
 src/video/emscripten/SDL_emscriptenevents.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/video/emscripten/SDL_emscriptenevents.c b/src/video/emscripten/SDL_emscriptenevents.c
index de9ec57ac8948..49a140f37e287 100644
--- a/src/video/emscripten/SDL_emscriptenevents.c
+++ b/src/video/emscripten/SDL_emscriptenevents.c
@@ -1095,11 +1095,11 @@ void Emscripten_UnregisterEventHandlers(SDL_WindowData *data)
     emscripten_set_pointerlockchange_callback(EMSCRIPTEN_EVENT_TARGET_DOCUMENT, NULL, 0, NULL);
 
     target = SDL_GetHint(SDL_HINT_EMSCRIPTEN_KEYBOARD_ELEMENT);
-    if (!target) {
+    if (!target || !*target) {
         target = EMSCRIPTEN_EVENT_TARGET_WINDOW;
     }
 
-    if (*target) {
+    if (SDL_strcmp(target, "#none") != 0) {
         emscripten_set_keydown_callback(target, NULL, 0, NULL);
         emscripten_set_keyup_callback(target, NULL, 0, NULL);
         emscripten_set_keypress_callback(target, NULL, 0, NULL);