aio: Fix a test and set race in aio_biowakeup.
Use atomic_fetchadd in place of separate atomic_subtract / atomic_load.
Reviewed by: markj
Sponsored by: HPE TidalScale
Differential Revision: https://reviews.freebsd.org/D38559
aio: Fix a test and set race in aio_biowakeup. Tags None Referenced Files None Subscribers None
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