Follow-up to 92a4fb3: allow kernel log dupes around edge of seqno

Although hihgly unlikely, if the kernel log sequence number (seqno)
reaches the end of its MAX value (18446744073709551615) we allow for
dupes to handle the wrap-around back to zero (0) in the counter.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/syslogd.c

@@ -1187,9 +1187,15 @@ void printsys(char *msg)
 			while (isdigit(*p))
 				seqno = 10 * seqno + (*p++ - '0');
 
-			/* Check if logged already (we've been restarted) */
-			if (sys_seqno > 0 && seqno <= sys_seqno)
-				return;
+			/*
+			 * Check if logged already (we've been restarted)
+			 * Account for wrap-around at 18446744073709551615
+			 */
+			if (sys_seqno > 0 && seqno <= sys_seqno) {
+				/* allow dupes around the edge */
+				if (sys_seqno < 18446744073709551000)
+					return;
+			}
 			sys_seqno = seqno;
 
 			p++;	      /* skip ',' */