async: remove racey uv_ref()
/uv_unref()
#705
Merged
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uv_ref()
can't be called from the non-event-loop thread. Furthermore,it is not necessary in
async.h
, because openuv_async_t
is alreadyholding the event loop from exiting.
See: #702
cc @jlongster
(NOTE: Tests for current master fail on my machine, so please check it with care!)