[gtk-frdp/wip/oholy/fix-empty-screen] Fix empty screen with recent freerdp versions

[Ondrej Holy <oholy src gnome org>]

commit e07338b03479c69213ee06da4d264af94fdbea92
Author: Ondrej Holy <oholy redhat com>
Date:   Wed Nov 21 11:15:06 2018 +0100

    Fix empty screen with recent freerdp versions
    
    With recent freerdp versions, gtk-frdp shows just an empty screen
    and prints the following:
    [15:33:45:659] [11955:11955] [ERROR][com.freerdp.core.transport]
    - transport_check_fds: transport->ReceiveCallback() - -4
    
    This is caused by the wrong return value from frdp_end_paint. Let's
    fix that return value to make it work again.
    
    https://gitlab.gnome.org/GNOME/gnome-boxes/issues/280

 src/frdp-session.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/frdp-session.c b/src/frdp-session.c
index b98d130..6843ee2 100644
--- a/src/frdp-session.c
+++ b/src/frdp-session.c
@@ -221,7 +221,7 @@ frdp_end_paint (rdpContext *context)
   gint pos_x, pos_y;
 
   if (gdi->primary->hdc->hwnd->invalid->null)
-    return FALSE;
+    return TRUE;
 
   x = gdi->primary->hdc->hwnd->invalid->x;
   y = gdi->primary->hdc->hwnd->invalid->y;