widl: Always set pass-by-reference return value in get_user_type. get_user_type.

[Gerald Pfeifer]

On Sat, 18 Nov 2017, Gerald Pfeifer wrote:
> Signed-off-by: Gerald Pfeifer <gerald at pfeifer.com>
> ---
>  tools/widl/typegen.c | 4 ++++
>  1 file changed, 4 insertions(+)

Strike that.  If this submission looks like a deja vu, well, it
is.  Somehow I had a mental replay going on, sorry about that.

Alexandre commented on that in
https://www.winehq.org/pipermail/wine-devel/2017-November/119425.html
for example, and I'll submit a patch following his recommendation.

Gerald