Fix a tight spin on epoll (or /dev/poll) that occurs when the EPOLLERR and

EPOLLHUP events are reported for a descriptor and there are no pending
operations.


[SVN r48031]

libs/asio

@@ -1 +1 @@
-Subproject commit 2d79a40ae68918b94fa56fdaf8ea87d9f4c81a26
+Subproject commit 71d47ca98c463e775fb50acc6a962d4d90a90fc9