Krispy Kreme is putting the dough in dough-nate. The national doughnut chain is giving away sweet treats to help combat the nationwide blood shortage through the end of January. People who donate blood to the American Red Cross will get a free dozen original glazed doughnuts when they show their donation sticker or confirmation of their donation through the organization’s donor app. The organization — which provides some 40% of the nation’s blood — announced earlier this month that it’s experiencing the worst blood shortage in over a decade, with a 10% decrease in donations since the start of …