[CIFS] Do not need to adjust for Jan/Feb for leap day

calculation in 2100 (year divisible by 100)
Signed-off-by: NYehuda Sadeh Weinraub <Yehuda.Sadeh@expand.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>

fs/cifs/netmisc.c

@@ -956,6 +956,7 @@ struct timespec cnvrtDosUnixTm(__u16 date, __u16 time)
 		days = days - 1;  /* do not count leap year for the year 2100 */
 
 	/* adjust for leap year where we are still before leap day */
+	if(year != 120)
 		days -= ((year & 0x03) == 0) && (month < 2 ? 1 : 0);
 	sec += 24 * 60 * 60 * days;