removed field 'n' from 'CallInfo' (not being used right now)

lstate.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.c,v 2.131 2015/10/20 13:11:05 roberto Exp roberto $
+** $Id: lstate.c,v 2.132 2015/11/02 16:01:41 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -111,7 +111,7 @@ CallInfo *luaE_extendCI (lua_State *L) {
   L->ci->next = ci;
   ci->previous = L->ci;
   ci->next = NULL;
-  ci->n = ++L->nci;
+  L->nci++;
   return ci;
 }
 
@@ -126,8 +126,8 @@ void luaE_freeCI (lua_State *L) {
   while ((ci = next) != NULL) {
     next = ci->next;
     luaM_free(L, ci);
+    L->nci--;
   }
-  L->nci = L->ci->n;
 }
 
 
@@ -136,17 +136,15 @@ void luaE_freeCI (lua_State *L) {
 */
 void luaE_shrinkCI (lua_State *L) {
   CallInfo *ci = L->ci;
-  CallInfo *next;
-  int n = (L->nci - ci->n + 1)/2;  /* number of entries to be preserved */
-  for (; n > 0; n--)
-    ci = ci->next;  /* skip items to be preserved */
-  lua_assert(n == 0);
-  while ((next = ci->next) != NULL) {  /* remove all other items */
-    ci->next = next->next;
-    luaM_free(L, next);  /* remove item */
-    n++;  /* count number of removed items */
+  CallInfo *next2;  /* next's next */
+  /* while there are two nexts */
+  while (ci->next != NULL && (next2 = ci->next->next) != NULL) {
+    luaM_free(L, ci->next);  /* free next */
+    L->nci--;
+    ci->next = next2;  /* remove 'next' from the list */
+    next2->previous = ci;
+    ci = next2;  /* keep next's next */
   }
-  L->nci -= n;
 }
 
 
@@ -161,7 +159,6 @@ static void stack_init (lua_State *L1, lua_State *L) {
   L1->stack_last = L1->stack + L1->stacksize - EXTRA_STACK;
   /* initialize first ci */
   ci = &L1->base_ci;
-  ci->n = 0;
   ci->next = ci->previous = NULL;
   ci->callstatus = 0;
   ci->func = L1->top;

lstate.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 2.126 2015/11/02 11:43:17 roberto Exp roberto $
+** $Id: lstate.h,v 2.127 2015/11/02 16:01:41 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -78,7 +78,6 @@ typedef struct CallInfo {
     } c;
   } u;
   ptrdiff_t extra;
-  unsigned short n;  /* ordinal number in call list */
   short nresults;  /* expected number of results from this function */
   lu_byte callstatus;
 } CallInfo;