fix aligned_malloc()

inline void* aligned_malloc(size_t size, size_t align) {

    void *result;

#ifdef _MSC_VER

    result = _aligned_malloc(size, align);

#elif defined (HAVE_POSIX_MEMALIGN)

    if(posix_memalign(&result, align, size)) {

	    result = 0;

    }

#else

    /* Use unaligned malloc as fallback */

    result = malloc(size);

#endif

    return result;

}