libpcp_web: fix small memory leak spotted by coverity
libpcp_web: fix small memory leak spotted by coverity

Ensure we free strings we allocate when parsing configs.

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