make check_data_type only for internal usage

scriptlib.cpp

@@ -7,7 +7,7 @@
 #include "scriptlib.h"
 #include "duel.h"
 
-int32 scriptlib::check_data_type(lua_State* L, int32 index, const char* tname) {
+static int32 check_data_type(lua_State* L, int32 index, const char* tname) {
 	int32 result = FALSE;
 	if(lua_getmetatable(L, index)) {
 		lua_getglobal(L, tname);

scriptlib.h

@@ -13,7 +13,6 @@
 
 class scriptlib {
 public:
-	static int32 check_data_type(lua_State* L, int32 index, const char* tname);
 	static int32 check_param(lua_State* L, int32 param_type, int32 index, BOOL retfalse = FALSE);
 	static int32 check_param_count(lua_State* L, int32 count);
 	static int32 check_action_permission(lua_State* L);