Niners draft Illinois speedster A.J. Jenkins at No. 30

The 49ers caught flak for “overdrafting” defensive end Aldon Smith and cornerback Chris Culliver in the first and third rounds, respectively, last April. Their 2012 first-round pick will also be billed as a reach, though coach Jim Harbaugh and G.M. Trent Baalke have earned the benefit of the doubt. With the 30th pick in the…