altos: Make ao_wakeup reentrant
authorKeith Packard <keithp@keithp.com>
Tue, 27 Aug 2013 01:44:23 +0000 (18:44 -0700)
committerKeith Packard <keithp@keithp.com>
Tue, 27 Aug 2013 01:47:27 +0000 (18:47 -0700)
In case we end up invoking it from two places at once.

Signed-off-by: Keith Packard <keithp@keithp.com>

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