Bx. DA jails frisked gun thugs, and judge wife lets ’em go free

He locks ’em up, and she sets ’em free. Dianne Renwick — one of the judges who tossed the stop-and-frisk conviction of a 14-year-old boy found with a gun in Harlem — is the wife of Bronx DA Robert Johnson. The former public defender and longtime defendants’ advocate was part of the…