fixed single s-record segment detection

s19/reader.go

@@ -151,6 +151,9 @@ func (*S19Reader) DetectAddressRanges(records []*SRecord) []AddressRange {
 			currentRange.SliceEnd = uint32(sliceIndex)
 		} else {
 			// Save the current range and start a new one
+			if currentRange.SliceEnd == 0 {
+				currentRange.SliceEnd = currentRange.SliceStart
+			}
 			ranges = append(ranges, *currentRange)
 			currentRange = &AddressRange{
 				SliceStart:   uint32(sliceIndex),