[gegl] json: remove unused errror pointer

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 1a3639fac3113c2ef1481841d0ab78b26732d2bb
Author: Andrzej Hunt <andrzej ahunt org>
Date:   Sat Aug 21 18:02:10 2021 +0200

    json: remove unused errror pointer
    
    We never check the error pointer, and therefore we also never free it - which
    can cause a leak in error situations. Therefore we remove it both to plug the
    leak and to simplify the function.

 operations/core/json.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/operations/core/json.c b/operations/core/json.c
index b34199d57..05c57d716 100644
--- a/operations/core/json.c
+++ b/operations/core/json.c
@@ -547,9 +547,8 @@ static GType
 json_op_register_type_for_file (GTypeModule *type_module, const gchar *filepath)
 {
     GType ret = 0;
-    GError *error = NULL;
     JsonParser *parser = json_parser_new();
-    const gboolean success = json_parser_load_from_file(parser, filepath, &error);
+    const gboolean success = json_parser_load_from_file(parser, filepath, NULL);
 
     if (success) {
         JsonNode *root_node = json_node_copy (json_parser_get_root (parser));