[ostree] metalink: Allow NULL for "out" params in metalink requests

[Giuseppe Scrivano <gscrivano src gnome org>]

commit ebef43eabe260333efaaffc19859d6ef4d98a3d4
Author: Matthew Barnes <mbarnes redhat com>
Date:   Wed Jun 10 14:37:42 2015 -0400

    metalink: Allow NULL for "out" params in metalink requests
    
    Caller may not be interested in all the outbound params, particularly
    "fetching_sync_uri".

 src/libostree/ostree-metalink.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/src/libostree/ostree-metalink.c b/src/libostree/ostree-metalink.c
index cbe859f..56bd12f 100644
--- a/src/libostree/ostree-metalink.c
+++ b/src/libostree/ostree-metalink.c
@@ -648,8 +648,10 @@ ostree_metalink_request_finish (OstreeMetalink         *self,
   if (g_task_propagate_boolean ((GTask*)result, error))
     {
       g_assert_cmpint (request->current_url_index, <, request->urls->len);
-      *out_target_uri = request->urls->pdata[request->current_url_index];
-      *out_data = g_strdup (request->result);
+      if (out_target_uri != NULL)
+        *out_target_uri = request->urls->pdata[request->current_url_index];
+      if (out_data != NULL)
+        *out_data = g_strdup (request->result);
       return TRUE;
     }
   else
@@ -708,7 +710,9 @@ _ostree_metalink_request_sync (OstreeMetalink        *self,
   data.out_data = out_data;
   data.loop = loop;
   data.error = error;
-  *fetching_sync_uri = _ostree_metalink_get_uri (self);
+
+  if (fetching_sync_uri != NULL)
+    *fetching_sync_uri = _ostree_metalink_get_uri (self);
 
   request->metalink = g_object_ref (self);
   request->urls = g_ptr_array_new_with_free_func ((GDestroyNotify) soup_uri_free);