Fix infinite loop in vnstat.php #30
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`popen()` can return `false` (something went wrong) or `null` (e.g. `popen()` is disabled), what results in a infinite loop when executing `while (!feof($fd) {}`
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popen()can returnfalse(something went wrong) ornull(e.g.popen()is disabled), what results in a infinite loop when executingwhile (!feof($fd) {}