pmmgr: plug mem leak after fetchgroup changes
pmmgr: plug mem leak after fetchgroup changes

Found by qa/666 ... diagnosed and fix provided by FChE (thanks).

wuliming/pcp,wuliming/pcp,wuliming/pcp,wuliming/pcp,wuliming/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp