use newer DATA API

include/mruby/data.h

@@ -46,9 +46,9 @@ void *mrb_data_check_get_ptr(mrb_state *mrb, mrb_value, const mrb_data_type*);
 /* obsolete functions and macros */
 #define mrb_data_check_and_get(mrb,obj,dtype) mrb_data_get_ptr(mrb,obj,dtype)
 #define mrb_get_datatype(mrb,val,type) mrb_data_get_ptr(mrb, val, type)
-#define mrb_check_datatype(mrb,val,type) mrb_data_check_and_get(mrb, val, type)
+#define mrb_check_datatype(mrb,val,type) mrb_data_get_ptr(mrb, val, type)
 #define Data_Get_Struct(mrb,obj,type,sval) do {\
-  *(void**)&sval = mrb_data_check_and_get(mrb, obj, type); \
+  *(void**)&sval = mrb_data_get_ptr(mrb, obj, type); \
 } while (0)
 
 #if defined(__cplusplus)