Fix BZ #18757 (fmemopen doesn't fail with invalid modes)

[Mike Frysinger]

On 09 Aug 2015 22:00, Paul Pluzhnikov wrote:
> -  return _IO_fopencookie (c, mode, iof);
> +  ret = _IO_fopencookie (c, mode, iof);
> +
> +  if (__glibc_unlikely (ret == NULL))
> +    {
> +      /* BZ #18757 -- set EINVAL.  */
> +      __set_errno (EINVAL);

i'm not sure normalizing all errors into EINVAL is correct.  you might get back
NULL if malloc failed in which case it'd be ENOMEM.  i think we want to plumb
errno setting down further where the actual errors are flagged and leave this
func alone.
-mike
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