Issue #641: Add a cast to void * to address some theoretically undefined printf behavior.

diff --git a/json_object.c b/json_object.c
index 73daa4c8c5305bb376675acb8072cfc524330890..2ee39ea58a2a4ccc2c978e8685226bfd1fbd8789 100644 (file)
--- a/json_object.c
+++ b/json_object.c
@@ -1635,7 +1635,7 @@ static int json_object_copy_serializer_data(struct json_object *src, struct json
        {
                _json_c_set_last_err(
                    "json_object_deep_copy: unable to copy unknown serializer data: %p\n",
-                   dst->_to_json_string);
+                   (void *)dst->_to_json_string);
                return -1;
        }
        dst->_user_delete = src->_user_delete;