Bug in ospf6_lsa_compare()

This fix is probably correct on 32bit systems,
but i think it will not work on 64bit systems.
sizeof(signed long) would be 8 and therefore the
cast from u_int32_t will map all the values to
non-negative part of long int.

You would like to use int (like in ospfd) and
change the type of seqnuma, seqnumb to that.

The type int32_t would be even more proper, but
sizeof(int) is 4 on relevant platforms.

Signed-off: Ondrej Zajicek <santiago@crfreenet.org>
Acked-by: Feng Lu <lu.feng@6wind.com>
Acked-by: Yasuhiro Ohara <yasu@jaist.ac.jp>

ospf6d/ospf6_lsa.c

@@ -306,7 +306,7 @@ ospf6_lsa_premature_aging (struct ospf6_lsa *lsa)
 int
 ospf6_lsa_compare (struct ospf6_lsa *a, struct ospf6_lsa *b)
 {
-  int seqnuma, seqnumb;
+  int32_t seqnuma, seqnumb;
   u_int16_t cksuma, cksumb;
   u_int16_t agea, ageb;
 
@@ -314,8 +314,8 @@ ospf6_lsa_compare (struct ospf6_lsa *a, struct ospf6_lsa *b)
   assert (b && b->header);
   assert (OSPF6_LSA_IS_SAME (a, b));
 
-  seqnuma = (int) ntohl (a->header->seqnum);
-  seqnumb = (int) ntohl (b->header->seqnum);
+  seqnuma = (int32_t) ntohl (a->header->seqnum);
+  seqnumb = (int32_t) ntohl (b->header->seqnum);
 
   /* compare by sequence number */
   if (seqnuma > seqnumb)