pmproxy: remove potential double-free on secure reads
pmproxy: remove potential double-free on secure reads

Resolves an issue being reported by valgrind.

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