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In function:
static void
SDLTest_ScreenShot(SDL_Renderer *renderer)
{
        //Some Code
        surface = SDL_CreateRGBSurface(0, viewport.w, viewport.h, 24,
        #if SDL_BYTEORDER == SDL_LIL_ENDIAN
                    0x00FF0000, 0x0000FF00, 0x000000FF,
        #else
                    0x000000FF, 0x0000FF00, 0x00FF0000,
       #endif
                    0x00000000);
    if (!surface) {
        fprintf(stderr, "Couldn't create surface: %s\n", SDL_GetError());
        return;
    }

    if (SDL_RenderReadPixels(renderer, NULL, surface->format->format,
                             surface->pixels, surface->pitch) < 0) {
        fprintf(stderr, "Couldn't read screen: %s\n", SDL_GetError());
        return;
    }

    if (SDL_SaveBMP(surface, "screenshot.bmp") < 0) {
        fprintf(stderr, "Couldn't save screenshot.bmp: %s\n", SDL_GetError());
        return;
    }
}

surface pointer getting leak while return so fix should be

    if (SDL_RenderReadPixels(renderer, NULL, surface->format->format,
                             surface->pixels, surface->pitch) < 0) {
        fprintf(stderr, "Couldn't read screen: %s\n", SDL_GetError());

        SDL_free(surface);

        return;
    }

    if (SDL_SaveBMP(surface, "screenshot.bmp") < 0) {
        fprintf(stderr, "Couldn't save screenshot.bmp: %s\n", SDL_GetError());

        SDL_free(surface);

        return;
    }

Thanks!