ncd: NCDModule: remove unused structure member

ncd/NCDModule.c

@@ -475,7 +475,6 @@ int NCDModuleProcess_Init (NCDModuleProcess *o, NCDModuleInst *n, const char *te
     ASSERT(handler_event)
     
     // init arguments
-    o->n = n;
     o->args = args;
     o->user = user;
     o->handler_event = handler_event;

ncd/NCDModule.h

@@ -288,7 +288,6 @@ typedef struct NCDModuleInst_s {
  * instance, implemented by the interpreter.
  */
 typedef struct NCDModuleProcess_s {
-    NCDModuleInst *n;
     NCDValue args;
     void *user;
     NCDModuleProcess_handler_event handler_event;