3.1.4 TTF_Quit

void TTF_Quit()

Shutdown and cleanup the truetype font API.
After calling this the SDL_ttf functions should not be used, excepting TTF_WasInit. You may, of course, use TTF_Init to use the functionality again.

TTF_Quit(); // you could SDL_Quit(); here...or not.

See Also:
3.1.2 TTF_Init, 3.1.3 TTF_WasInit