[SeaBIOS] [PATCH] nmi: Don't try to switch onto extra stack in NMI handler

[Kevin O'Connor]

On Wed, Dec 23, 2015 at 03:47:26PM -0500, Kevin O'Connor wrote:
> The NMI could occur when already on the extra stack, which would
> corrupt it.  Always use the current stack on an NMI to avoid this.

FYI, I committed this change.

-Kevin