If you have an lldb-dap log file you'll almost always see a final
message like:
```
<--
Content-Length: 94
{
"body": {
"category": "stdout",
"output": "\u0000\u0000"
},
"event": "output",
"seq": 0,
"type": "event"
}
<--
Content-Length: 94
{
"body": {
"category": "stderr",
"output": "\u0000\u0000"
},
"event": "output",
"seq": 0,
"type": "event"
}
```
The OutputRedirect is always writing the `"\0"` byte as a final stdout
message during shutdown. Instead, I adjusted this to detect the sentinel
value and break out of the read loop as if we detected EOF.
---------
Co-authored-by: Pavel Labath <pavel@labath.sk>
c2e96778e0