[PATCH] core: fix when no slow/writable keys available

[Víctor Manuel Jáquez Leal <vjaquez igalia com>]

When the source doesn't have slow/writable keys (empty set) the key list is
not filtered.

This patch set to NULL the filtered key list, and the returned complement is
the passed key list.

Signed-off-by: Víctor Manuel Jáquez Leal <vjaquez igalia com>
---
 src/grl-metadata-source.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/grl-metadata-source.c b/src/grl-metadata-source.c
index 8395dbf..cbb56c0 100644
--- a/src/grl-metadata-source.c
+++ b/src/grl-metadata-source.c
@@ -795,8 +795,10 @@ grl_metadata_source_filter_slow (GrlMetadataSource *source,
 
   slow_keys = grl_metadata_source_slow_keys (source);
   if (!slow_keys) {
+    GList *_keys = *keys;
+    *keys = NULL;
     if (return_filtered) {
-      return g_list_copy (*keys);
+      return _keys;
     } else {
       return NULL;
     }
@@ -832,8 +834,10 @@ grl_metadata_source_filter_writable (GrlMetadataSource *source,
 
   writable_keys = grl_metadata_source_writable_keys (source);
   if (!writable_keys) {
+    GList *_keys = *keys;
+    *keys = NULL;
     if (return_filtered) {
-      return g_list_copy (*keys);
+      return _keys;
     } else {
       return NULL;
     }
-- 
1.7.1