Fixes possible buffer overflow when printing BGP attributes.

{

  unsigned int i = EA_ID(a->id);

  struct attr_desc *d;

  int len;

  if (ATTR_KNOWN(i))

    {

      d = &bgp_attr_table[i];

      buf += bsprintf(buf, "%s", d->name);

      len = bsprintf(buf, "%s", d->name);

      buf += len;

      if (d->format)

	{

	  *buf++ = ':';

	  *buf++ = ' ';

	  d->format(a, buf, buflen);

	  d->format(a, buf, buflen - len - 2);

	  return GA_FULL;

	}

      return GA_NAME;