`StackTraceStringResolver` uses instance after recycling

[vy]

StackTraceStringResolver contains the following lines:

@Override
public void resolve(
        final Throwable throwable,
        final JsonWriter jsonWriter) {
    final TruncatingBufferedPrintWriter srcWriter = srcWriterRecycler.acquire();
    try {
        throwable.printStackTrace(srcWriter);
        final TruncatingBufferedPrintWriter dstWriter = truncate(srcWriter);
        jsonWriter.writeString(dstWriter);
    } finally {
        srcWriterRecycler.release(srcWriter);
    }
}

private TruncatingBufferedPrintWriter truncate(
        final TruncatingBufferedPrintWriter srcWriter) {

    // ...

    // Allocate temporary buffers and truncate the input.
    final TruncatingBufferedPrintWriter dstWriter =
            dstWriterRecycler.acquire();
    try {
        // ...
    } finally {
        dstWriterRecycler.release(dstWriter);
    }
    return dstWriter;

}

dstWriter created in truncate() recycled there, though used in resolve() later on.

[vy]

Fixed in 9e1a437 for 2.x and in ccfff49 for main.