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OpenPrinterEx requests have been observed in the wild carrying a device mode formname "A4" followed by non-utf16 garbage after the null terminator. Such requests currently fail during unmarshalling in the ndr_pull_charset() codepath, causing intermittent print job failures. This change ensures that garbage after the device mode formname null terminator is not processed in unmarshalling. https://bugzilla.samba.org/show_bug.cgi?id=8606 Signed-off-by: Jeremy Allison <jra@samba.org>