Silence some warnings when $p0f->{genre} is undefined
Silence some warnings when $p0f->{genre} is undefined

salvis/qpsmtpd,sieutruc/qpsmtpd,sieutruc/qpsmtpd,msimerson/qpsmtpd,priyadi/qpsmtpd,sieutruc/qpsmtpd,salvis/qpsmtpd,smtpd/qpsmtpd,priyadi/qpsmtpd,msimerson/qpsmtpd,smtpd/qpsmtpd,priyadi/qpsmtpd