RFR: 8065: Remove socket read illegal value [v2]

[xpbob]

> <img width="647" alt="图片" src="https://user-images.githubusercontent.com/7837910/231723450-21839fe4-4454-4e25-bf59-308526ac0c10.png">
> 
> 
> Socket read failure returns -1
> Negative statistics affect accuracy
> 
> After modification
> <img width="548" alt="图片" src="https://user-images.githubusercontent.com/7837910/231723666-e9dd7983-a8de-4a14-b1e3-3dfad3dc6572.png">

xpbob has updated the pull request incrementally with one additional commit since the last revision:

  change code style

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

Changes:
  - all: https://git.openjdk.org/jmc/pull/478/files
  - new: https://git.openjdk.org/jmc/pull/478/files/aa4851cc..989ade49

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmc&pr=478&range=01
 - incr: https://webrevs.openjdk.org/?repo=jmc&pr=478&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 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