bearer-mbim: fix error handling in connection status reload

We should not set the GError as autoptr(), as we're returning it as
part of the GTask.

src/mm-bearer-mbim.c

@@ -1592,8 +1592,8 @@ reload_connection_status_ready (MbimDevice   *device,
     guint32                   session_id;
     MbimActivationState       activation_state;
     MMBearerConnectionStatus  bearer_connection_status = MM_BEARER_CONNECTION_STATUS_UNKNOWN;
+    GError                   *error = NULL;
     g_autoptr(MbimMessage)    response = NULL;
-    g_autoptr(GError)         error = NULL;
 
     self = g_task_get_source_object (task);