RFR: 8065: Remove socket read illegal value

Thu Apr 13 09:54:41 UTC 2023

![图片](https://user-images.githubusercontent.com/7837910/231721224-245f14e6-d3b7-4cc4-b1d0-b281ffdc272e.png)
Socket read failure returns -1
Negative statistics affect accuracy

After modification
<img width="864" alt="图片" src="https://user-images.githubusercontent.com/7837910/231722177-df3d0028-cb8d-4cb9-8f3e-3425e250547a.png">

-------------

Commit messages:
 - 8065: Remove socket read illegal value

Changes: https://git.openjdk.org/jmc/pull/478/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=478&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8065
  Stats: 37 lines in 2 files changed: 35 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jmc/pull/478.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/478/head:pull/478

PR: https://git.openjdk.org/jmc/pull/478