Steve Smith scored 76 off 82 balls as Australia easily chased down the modest 230-run target. © Twitter Australia’s Steve Smith was back in the groove on Wednesday with 76 on his return to cricket in England, but team-mate Usman Khawaja suffered an injury scare during the unofficial World Cup warm-up match against the Windies. Steve Smith and David Warner returned to international duty earlier this month after completing one-year international bans for their roles in a ball-tampering scandal in South Africa. Both top-order batsmen took part in three warm-up matches at home to a New Zealand XI, but Wednesday’s hastily arranged match in Southampton was their first in England since completing their suspensions.Wednesday’s match saw Steve Smith lead the way as he guided Australia to a modest target of 230 in a seven-wicket win for the reigning world champions.But there were two concerning moments for the Aussies, whose World Cup 2019 campaign starts against Afghanistan in Bristol on June 1.Khawaja lasted just two overs before he was struck on the jaw by an Andre Russell bouncer and retired hurt following on-field treatment.He was later sent to hospital for a precautionary X-ray.Warner, who replaced Khawaja at the crease, had made…