[wing/wip/nacho/poll-stream] Define private properly

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 251d9f20296374b55b39c7b208d05bce839845a0
Author: Ignacio Casal Quinteiro <qignacio amazon com>
Date:   Wed Nov 28 16:15:36 2018 +0100

    Define private properly

 wing/winginputstream.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/wing/winginputstream.c b/wing/winginputstream.c
index c1c94b3..8920c8c 100644
--- a/wing/winginputstream.c
+++ b/wing/winginputstream.c
@@ -33,12 +33,12 @@
  * Windows file handle.
  */
 
-struct _WingInputStreamPrivate {
+typedef struct {
   HANDLE handle;
   gboolean close_handle;
 
   OVERLAPPED overlap;
-};
+} WingInputStreamPrivate;
 
 enum {
   PROP_0,