ia_call_function, vérification que « player » est bien une stratégie.

main.c

@@ -37,6 +37,12 @@ enum bool ia_call_function(const struct player_t player, enum api_function_t api
  void (*ia_function_pf)();
  int a; enum hole_t b;
  void *c, *d;
+ if(!player.ia_lib_p) {
+#ifdef debug
+  fputs("the player is not a strategy.\n",stderr);
+#endif
+  return false;
+ }
  va_start(ap, result);
  switch(api_function) {
   case ia_lib_init: