Sean O’Brien believes Italy struggles will help Ireland against France

• Sunday’s Pool D match decides who avoids New Zealand quarter-final• O’Brien says of Italy game: ‘No harm for Ireland to have Test match like that’The Ireland flanker Sean O’Brien believes the Six Nations champions will respond to the unimpressive victory over Italy at the weekend by fixing various faults before they face France in Cardiff in Sunday for the group title and a quarter-final against Argentina rather than the All Blacks.Italy had been the least impressive tier one nation, including England, going into Sunday’s encounter against Ireland at the Olympic Stadium, but the return of th…