net: fix UDPConn readers to return truncated payload size instead of 0
Calling UDPConn readers (Read, ReadFrom, ReadMsgUDP) to read part of datagram returns error (in Windows), mentioning there is more data available, and 0 as size of read data, even though part of data is already read. This fix makes UDPConn readers to return truncated payload size, even there is error due more data available to read. Fixes #14074 Updates #18056 Change-Id: Id7eec7f544dd759b2d970fa2561eef2937ec4662 Reviewed-on: https://go-review.googlesource.com/92475 Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Mikio Hara <mikioh.mikioh@gmail.com>
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