[gnome-boxes] installer-media: Mark nullable constructor params as such

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit f28db61c9cbf0ac9551bf5fca0da8fbc6eebf680
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Sat Nov 17 18:30:39 2012 +0200

    installer-media: Mark nullable constructor params as such
    
    https://bugzilla.gnome.org/show_bug.cgi?id=688770

 src/installer-media.vala |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/installer-media.vala b/src/installer-media.vala
index fde8cc0..3f1dedb 100644
--- a/src/installer-media.vala
+++ b/src/installer-media.vala
@@ -27,8 +27,8 @@ private class Boxes.InstallerMedia : GLib.Object {
 
     public InstallerMedia.from_iso_info (string           path,
                                          string           label,
-                                         Os               os,
-                                         Media            media,
+                                         Os?              os,
+                                         Media?           media,
                                          Osinfo.Resources resources) {
         this.device_file = path;
         this.os = os;