trace fixes

- 'command_name' is not required
- fix double free of task context

src/device_driver.c

@@ -595,9 +595,7 @@ static int parse_command(const char *data)
         const char *command_name = json_object_get_string(data_root, "command_name");
         if (!command_name)
         {
-            pr_err("missing 'command_name' property # command[%s]", command);
-            status = -EINVAL;
-            goto request_trace_out;
+            command_name = "";
         }
 
         pr_debug("manage trace # command[%s] action[%s] pid[%d] uid[%d] command_name[%s]", command, action, pid, uid, command_name);

src/trace.c

@@ -360,6 +360,9 @@ int trace_log(const tcp_connection_context *conn_ctx, const char *message, int l
     va_end(args);
 
     send_message("log", json_serialize_to_string(root_value), task_ctx);
+    json_value_free(root_value);
+
+    return ret;
 
 out:
     json_value_free(root_value);