[gtk+/portal] Fix the 'multiple' addition

[Matthias Clasen <matthiasc src gnome org>]

commit e9136a90285b5358c5a58810c78fd088640fa291
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jul 6 20:53:40 2016 -0400

    Fix the 'multiple' addition
    
    I was trying to add a native boolean for 'v'. Ouch.

 gtk/gtkfilechoosernativeportal.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkfilechoosernativeportal.c b/gtk/gtkfilechoosernativeportal.c
index 31786cc..c355601 100644
--- a/gtk/gtkfilechoosernativeportal.c
+++ b/gtk/gtkfilechoosernativeportal.c
@@ -336,7 +336,8 @@ gtk_file_chooser_native_portal_show (GtkFileChooserNative *self)
     }
 
   g_variant_builder_init (&opt_builder, G_VARIANT_TYPE_VARDICT);
-  g_variant_builder_add (&opt_builder, "{sv}", "multiple", multiple);
+  g_variant_builder_add (&opt_builder, "{sv}", "multiple",
+                         g_variant_new_boolean (multiple));
   if (self->accept_label)
     g_variant_builder_add (&opt_builder, "{sv}", "accept_label",
                            g_variant_new_string (self->accept_label));