Merge pull request #16319 from FRRouting/mergify/bp/stable/10.0/pr-16233

ripd/ripd.c - rip_auth_md5 : Change the start value of sequence 1 to 0 (backport #16233)

ripd/ripd.c

@@ -1051,7 +1051,7 @@ static size_t rip_auth_md5_ah_write(struct stream *s, struct rip_interface *ri,
 	/* RFC2080: The value used in the sequence number is
 	   arbitrary, but two suggestions are the time of the
 	   message's creation or a simple message counter. */
-	stream_putl(s, ++seq);
+	stream_putl(s, seq++);
 
 	/* Reserved field must be zero. */
 	stream_putl(s, 0);