By Leika Kihara HIROSHIMA, Japan (Reuters) - A Bank of Japan board member who voted for last month's huge monetary expansion defended the move on Wednesday, saying that failing to act would have cast doubt on the bank's determination to hit its price goal and undermined its credibility. Having deployed "the maximum scale of stimulus possible," the BOJ can now wait to see how much the move will support the economy and prices, Sayuri Shirai said, signaling that no further monetary easing was necessary in the near term. ...