Fix #78976: SplFileObject::fputcsv returns -1 on failure

`php_stream_write()` returns `-1` on failure now, which has to be
catered to by `SplFileObject::fputcsv()` which still is suppose

Fix #78976: SplFileObject::fputcsv returns -1 on failure

`php_stream_write()` returns `-1` on failure now, which has to be
catered to by `SplFileObject::fputcsv()` which still is supposed to
return `false` on failure.

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