Error: Driver 'gpio-keys-polled' is already registered, aborting...

Just starting to play with a new Yun. It all seems to work fine. I have an 8Gb SD Card fitted.
I can access LuCI via web browser.
I have loaded the yunserialterminal program.
I note that when I boot, I see the following error message in the log:
[ 5.020000]Error: Driver 'gpio-keys-polled' is already registered, aborting...
and I wondered what this meant, and do I need to fix it?

Thanks, Anthony

It's not a problem.
I don't know why it happens: it looks like two modules try to load module gpio-keys-polled and the second time kernel just reports an "already done"

Thanks Frederico. Perhaps it will be fixed in a subsequent release. Anthony