fix memory leak. free the devname string if it already exists in the hash table
fix memory leak. free the devname string if it already exists in the hash table

git-svn-id: 27e0aca8c7a52a9ae65dfba2e16879604119af8c@933 93a4e39c-3214-0410-bb16-828d8e3bcd0f

fastly/ganglia,fastly/ganglia,fastly/ganglia,fastly/ganglia,fastly/ganglia