Rusty Russell 5f8b77480c plugins: fix error report from bitcoin-cli exec failure. ...

We've stomped errno, so if exec fails we don't get a reliable result:

```
2023-08-07T17:58:45.713Z **BROKEN** plugin-bcli: bitcoin-cli exec failed: Bad file descriptor
```

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2023-08-09 19:53:47 +09:30

33 KiB

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