Fix OP_STRING16, use FETCH_BS
@@ -2243,7 +2243,7 @@ static inline int op_string( mrbc_vm *vm, mrbc_value *regs )
*/
static inline int op_string16( mrbc_vm *vm, mrbc_value *regs )
{
- FETCH_BB();
+ FETCH_BS();
#if MRBC_USE_STRING
mrbc_object *pool_obj = vm->pc_irep->pools[b];
