The param_free function frees the pb_param structure specified by pp and its associated structures. Use the param_free function to dispose a pb_param after removing it from a pblock with pblock_remove.
int param_free(pb_param *pp);
1 if the parameter was freed or 0 if the parameter was NULL.
pb_param *pp is the name-value pair stored in a pblock.
if (param_free(pblock_remove("content-type", rq-srvhdrs))) return; /* we removed it */