[grilo-plugins] lua-factory: Use correct parameter for 'range-filter' option

[Bastien Nocera <hadess src gnome org>]

commit 94a13e2c71963d81fbf495cdf690c9d280680669
Author: George Sedov <radist morse gmail com>
Date:   Wed Aug 5 04:14:57 2015 +0300

    lua-factory: Use correct parameter for 'range-filter' option
    
    https://bugzilla.gnome.org/show_bug.cgi?id=753141

 src/lua-factory/grl-lua-library.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/lua-factory/grl-lua-library.c b/src/lua-factory/grl-lua-library.c
index 1023254..90acfa4 100644
--- a/src/lua-factory/grl-lua-library.c
+++ b/src/lua-factory/grl-lua-library.c
@@ -806,8 +806,8 @@ grl_l_operation_get_options (lua_State *L)
     const gchar *key_name = NULL;
     GrlRegistry *registry = grl_registry_get_default ();
 
-    luaL_argcheck (L, lua_isstring (L, 3), 3, "expecting key name");
-    key_name = lua_tostring (L, 3);
+    luaL_argcheck (L, lua_isstring (L, 2), 2, "expecting key name");
+    key_name = lua_tostring (L, 2);
 
     key = grl_registry_lookup_metadata_key (registry, key_name);
     if (key != GRL_METADATA_KEY_INVALID) {