Drinks maker cuts annual sale and profit forecast for second time in four months amid weak demand in US and ChinaDiageo has slashed its dividend and cut its annual sales and profit forecast for the second time in four months, as the maker of Guinness warned of capacity constraints affecting drinkers of “the black stuff” in London pubs.The world’s largest spirits maker – which owns brands including Smirnoff vodka, Johnnie Walker whisky and Don Julio tequila – reported weak demand in the US and Ch...