free info object

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1696 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
fix type casting compile warning

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1697 c368ceb8-fd28-0410-a457-e46ee1d7cd4a