[CIFS] Fix leaps year calculation for years after 2100

	year = sd->Year;

	year = sd->Year;

	days += year * 365;

	days += year * 365;

	days += (year/4); /* leap year */

	days += (year/4); /* leap year */

	/* generalized leap year calculation is more complex, ie no leap year

	for years/100 except for years/400, but since the maximum number for DOS

	 year is 2**7, the last year is 1980+127, which means we need only

	 consider 2 special case years, ie the years 2000 and 2100, and only

	 adjust for the lack of leap year for the year 2100, as 2000 was a 

	 leap year (divisable by 400) */

	if(year >= 120)  /* the year 2100 */

		days = days - 1;  /* do not count leap year for the year 2100 */

	/* adjust for leap year where we are still before leap day */

	/* adjust for leap year where we are still before leap day */

	days -= ((year & 0x03) == 0) && (month < 2 ? 1 : 0);

	days -= ((year & 0x03) == 0) && (month < 2 ? 1 : 0);

	sec += 24 * 60 * 60 * days; 

	sec += 24 * 60 * 60 * days;