[CIFS] Fix minor problems noticed by scan

Coverity scan pointed out some minor possible errors.

Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index 2bfed3f..9ae4941 100644
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c
@@ -899,8 +899,11 @@
 		cERROR(1, ("illegal hours %d", st->Hours));
 	days = sd->Day;
 	month = sd->Month;
-	if ((days > 31) || (month > 12))
+	if ((days > 31) || (month > 12)) {
 		cERROR(1, ("illegal date, month %d day: %d", month, days));
+		if (month > 12)
+			month = 12;
+	}
 	month -= 1;
 	days += total_days_of_prev_months[month];
 	days += 3652; /* account for difference in days between 1980 and 1970 */