Make ensure_capacity a bit more pedantically correct

  sl->num_used = 0;

}

#if SIZE_MAX < INT_MAX

#error "We don't support systems where size_t is smaller than int."

#endif

/** Make sure that <b>sl</b> can hold at least <b>size</b> entries. */

static INLINE void

smartlist_ensure_capacity(smartlist_t *sl, size_t size)

{

#if SIZEOF_SIZE_T > SIZEOF_INT

  /* Set MAX_CAPACITY to MIN(INT_MAX, SIZE_MAX / sizeof(void*)) */

#if (SIZE_MAX/SIZEOF_VOID_P) > INT_MAX

#define MAX_CAPACITY (INT_MAX)

#else

#define MAX_CAPACITY (int)((SIZE_MAX / (sizeof(void*))))