core: Look up refs like origin/foo correctly again

We want to support both "bare" lookups where "foo" can be local, or in
any remote, as well as prefixed ones for a specific remote.

This fixes ostree-pull noticing that nothing has changed.

src/libostree/ostree-repo.c

@@ -380,6 +380,12 @@ ostree_repo_resolve_rev (OstreeRepo     *self,
     {
       child = g_file_resolve_relative_path (priv->local_heads_dir, rev);
 
+      if (!g_file_query_exists (child, NULL))
+        {
+          g_clear_object (&child);
+
+          child = g_file_resolve_relative_path (priv->remote_heads_dir, rev);
+
           if (!g_file_query_exists (child, NULL))
             {
               g_clear_object (&child);
@@ -399,6 +405,7 @@ ostree_repo_resolve_rev (OstreeRepo     *self,
                     g_clear_object (&child);
                 }
             }
+        }
 
       if (child)
         {

src/ostree/ostree-pull.c

@@ -463,7 +463,6 @@ ostree_builtin_pull (int argc, char **argv, GFile *repo_path, GError **error)
   OstreeRepo *repo = NULL;
   const char *remote;
   const char *branch;
-  char *remote_branch_ref_path = NULL;
   char *key = NULL;
   char *baseurl = NULL;
   char *refpath = NULL;
@@ -566,7 +565,6 @@ ostree_builtin_pull (int argc, char **argv, GFile *repo_path, GError **error)
   g_free (original_rev);
   g_free (baseurl);
   g_free (refpath);
-  g_free (remote_branch_ref_path);
   g_clear_object (&soup);
   if (base_uri)
     soup_uri_free (base_uri);