People v. Miller, 202 Cal.App.4th 1450 (5th Dist. Jan.27, 2012) (rejecting collateral attack against a plea to felony possession of diazepam, brought after the appellant had served the full term of his probation, where there was error in charging and accepting the plea to diazepam possession as a felony, when by statute it is at most a misdemeanor, but for reasons of public policy, the appellant was estopped from having his plea vacated and his conviction modified by his consent to the plea agreement).