http: set the HTTP status on directory listing

Fix a HTTP response header like the following:

HTTP/1.1 0 (null)
Server: ostree-httpd libsoup/2.48.0
Date: Tue, 07 Oct 2014 11:19:22 GMT
Content-Type: text/html
Content-Length: 12533

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

src/ostree/ot-builtin-trivial-httpd.c

@@ -205,6 +205,7 @@ do_get (OtTrivialHttpd    *self,
               soup_message_set_response (msg, "text/html",
                                          SOUP_MEMORY_TAKE,
                                          listing->str, listing->len);
+              soup_message_set_status (msg, SOUP_STATUS_OK);
               g_string_free (listing, FALSE);
             }
         }