Pod Lua memleak fix
The memleak can be seen running the pod.lua
unit test with valgrind:
$ WIREPLUMBER_MODULE_DIR=build/modules valgrind --suppressions=/usr/share/glib-2.0/valgrind/glib.supp --leak-check=full --keep-debuginfo=yes ./build/tests/wplua/script-tester tests/wplua/scripts/pod.lua