[grilo-plugins] tmdb: Fix reversed return arg check

[Juan A. Suarez Romero <jasuarez src gnome org>]

commit 8ddccd23344e0d4500051e89e56f62324568fa7d
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Jan 6 17:23:12 2014 +0100

    tmdb: Fix reversed return arg check
    
    grl_tmdb_source_may_resolve() was checking for missing_keys the
    wrong way around.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=721642

 src/tmdb/grl-tmdb.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/tmdb/grl-tmdb.c b/src/tmdb/grl-tmdb.c
index dcdbcaf..fb9abf6 100644
--- a/src/tmdb/grl-tmdb.c
+++ b/src/tmdb/grl-tmdb.c
@@ -1210,7 +1210,7 @@ grl_tmdb_source_may_resolve (GrlSource *source,
 
   /* Caller wants to check what's needed to resolve */
   if (!media) {
-    if (!missing_keys)
+    if (missing_keys)
       *missing_keys = grl_metadata_key_list_new (GRL_METADATA_KEY_TITLE, NULL);
 
     return FALSE;
@@ -1219,7 +1219,7 @@ grl_tmdb_source_may_resolve (GrlSource *source,
   /* We can do nothing without a title or the movie-id */
   if (!grl_data_has_key (GRL_DATA (media), GRL_METADATA_KEY_TITLE) &&
           !grl_data_has_key (GRL_DATA (media), GRL_TMDB_METADATA_KEY_TMDB_ID)) {
-    if (!missing_keys)
+    if (missing_keys)
       *missing_keys = grl_metadata_key_list_new (GRL_METADATA_KEY_TITLE, NULL);
 
     return FALSE;