BERLIN, Feb 23 (Reuters) - American actor George Clooney stepped up his criticism of George W. Bush's administration on Sunday, saying he feared a war against Iraq was inevitable but would ultimately only lead to more violence. "America's policies frustrate me," Clooney said in a German television programme. "I think a war against Iraq is as unavoidable as it senseless. I think it's coming. But I also think the real danger is going to be what happens after it." Clooney, who in interviews with European newspapers has accused Bush of war-mongering over Iraq, is on a growing list of Hollywood...