message: Fix Coverity Issue 171129
  Current is an unsigned int so it can never be less than 0. I removed the condition that looks for current < 0
diff: @@ -224,7 +224,7 @@ int SQLPTRepresentation::DaysBeforeExchange(uint16_t current) {
  return limit;
  }
  - if (limit < 0 || last < 0 || current < 0 || current < last ||
  + if (limit < 0 || last < 0 || current < last ||
  limit < (current - last)) {
  return 0;
  }
  