inspector: fix crash when receiving non json message

[islandryu]

I fixed an issue where Node.js would crash if a WebSocket client sent a non-JSON message while the Inspector was open, like in the following example:

const socket = new WebSocket('ws://127.0.0.1:9229/e9817809-7f12-450b-ae45-e1fe9be416f4');

socket.addEventListener('open', (event) => {
    socket.send('Hello Server!');
});

Sorry, this issue was due to a mistake in the implementation of the following change.
#56759

[nodejs-github-bot]

Review requested:

• @nodejs/inspector

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.58%. Comparing base (2fb82c8) to head (db32729).
⚠️ Report is 64 commits behind head on main.

Files with missing lines	Patch %	Lines
src/inspector_io.cc	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60388      +/-   ##
==========================================
- Coverage   88.59%   88.58%   -0.02%     
==========================================
  Files         704      704              
  Lines      208474   207817     -657     
  Branches    40067    40039      -28     
==========================================
- Hits       184696   184090     -606     
+ Misses      15805    15762      -43     
+ Partials     7973     7965       -8     

Files with missing lines	Coverage Δ
src/inspector_io.cc	91.80% <0.00%> (-0.76%)	⬇️

... and 132 files with indirect coverage changes

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[legendecas]

LGTM with the test skipped when inspector disabled.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69919/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69924/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69928/