dns: Set the result to null in cancelLookup()
When lookupHost() is called the handle returned from allocateHandle() might be a reused handle. The delegate will be cleared, but the result might still be there and the assert in lookupHost() will fail: ``` assert(!m_lookups[handle].result); ```
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@ -132,6 +132,7 @@ final class EventDriverDNS_GAI(Events : EventDriverEvents, Signals : EventDriver
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{
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if (!isValid(handle)) return;
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m_lookups[handle].callback = null;
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m_lookups[handle].result = null;
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m_events.loop.m_waiterCount--;
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}
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