small changes (preparing for new module of pre-compilation)

func.c

@@ -19,8 +19,12 @@ static int maxcurrvars = 0;
 */
 void luaI_initTFunc (TFunc *f)
 {
+  f->next = NULL;
+  f->marked = 0;
+  f->size = 0;
   f->code = NULL;
   f->lineDefined = 0;
+  f->fileName = NULL;
   f->locvars = NULL;
 }
 

func.h

@@ -17,7 +17,7 @@ typedef struct LocVar
 typedef struct TFunc
 {
   struct TFunc	*next;
-  char		marked;
+  int		marked;
   int		size;
   Byte		*code;
   int		lineDefined;