Fix resource leak in ioStreamRead useNIO branch

[Copilot]

reader.close() in the useNIO path of ioStreamRead was only reached on normal exit or early-return — any exception thrown by reader.read(...) or aFunction(...) would silently leak the reader and its underlying stream.

Change

Replaced the two explicit reader.close() calls with a single try/finally block, guaranteeing closure on all exit paths:

try {
    while ((nRead = reader.read(cbuf, 0, bufferSize)) > 0) {
        var res = aFunction(String(new java.lang.String(cbuf, 0, nRead)));
        if (res == true) {
            return;
        }
    }
} finally {
    reader.close();
}

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