Prevent resource leak in SDL backend #137
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When twin_sdl_init() fails after successful SDL_Init() but before completion (e.g., SDL_CreateWindow fails), the SDL subsystem is not properly cleaned up, leaking system resources. The bail chain was missing SDL_Quit() cleanup. Error paths jumped directly to 'bail' label which only freed memory, leaving SDL initialized.
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When twin_sdl_init() fails after successful SDL_Init() but before completion (e.g., SDL_CreateWindow fails), the SDL subsystem is not properly cleaned up, leaking system resources.
The bail chain was missing SDL_Quit() cleanup. Error paths jumped directly to 'bail' label which only freed memory, leaving SDL initialized.
Summary by cubic
Properly shuts down SDL when twin_sdl_init fails, preventing a resource leak after SDL_Init succeeds but window creation fails.