fix spelling

Jan Willamowius

2019-04-17 e3975eaa481ebcadf19730b89444bd2da11ab54c

 src/library/LicenseReader.cpp

@@ -90,8 +90,9 @@
         license->days_left = 999999;
      } else {
         strncpy(license->expiry_date, to_date.c_str(), 11);
         double secs = difftime(time(NULL),
               seconds_from_epoch(to_date.c_str()));
         double secs = difftime(
            seconds_from_epoch(to_date.c_str()),
            time(NULL));
         license->days_left = (int) secs / 60 * 60 * 24;
      }
   }