nmi: Don't try to switch onto extra stack in NMI handler

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.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
1 file changed
tree: 59158951182cd2a7f430fdd15b67354b72e60c31
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