Has Wall Street gone a bit overboard punishing Mallinckrodt (MNK). Getty Images The drug maker’s share price continued to fall Wednesday, extending the gut-churning 35% selloff it suffered yesterday on the heels of a disappointing third quarter earnings report. Driving today’s drop? Analysts at Goldman Sachs, Wells Fargo and Barclays all downgraded Mallinckrodt, retreating from […]