Unchecked Return Value in WIN_SuspendScreenSaver (#12316)

src/video/windows/SDL_windowsvideo.c

@@ -76,10 +76,15 @@ static void SDLCALL UpdateWindowFrameUsableWhileCursorHidden(void *userdata, con
 #if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
 static bool WIN_SuspendScreenSaver(SDL_VideoDevice *_this)
 {
+    DWORD result;
     if (_this->suspend_screensaver) {
-        SetThreadExecutionState(ES_CONTINUOUS | ES_DISPLAY_REQUIRED);
+        result = SetThreadExecutionState(ES_CONTINUOUS | ES_DISPLAY_REQUIRED);
     } else {
-        SetThreadExecutionState(ES_CONTINUOUS);
+        result = SetThreadExecutionState(ES_CONTINUOUS);
+    }
+    if (result == 0) {
+        SDL_SetError("SetThreadExecutionState() failed");
+        return false;
     }
     return true;
 }