Cleaner this way I think.
Index: frag6.c
===================================================================
RCS file: /cvs/src/sys/netinet6/frag6.c,v
retrieving revision 1.65
diff -u -p -r1.65 frag6.c
--- frag6.c 22 Oct 2015 10:22:53 -0000 1.65
+++ frag6.c 3 Dec 2015 11:44:10 -0000
@@ -215,9 +215,7 @@ frag6_input(struct mbuf **mp, int *offp,
* If maxfrag is 0, never accept fragments.
* If maxfrag is -1, accept all fragments without limitation.
*/
- if (ip6_maxfrags < 0)
- ;
- else if (frag6_nfrags >= (u_int)ip6_maxfrags)
+ if (ip6_maxfrags >= 0 && frag6_nfrags >= (u_int)ip6_maxfrags)
goto dropfrag;
TAILQ_FOREACH(q6, &frag6_queue, ip6q_queue)
@@ -239,9 +237,8 @@ frag6_input(struct mbuf **mp, int *offp,
* If maxfragpackets is -1, accept all fragments without
* limitation.
*/
- if (ip6_maxfragpackets < 0)
- ;
- else if (frag6_nfragpackets >= (u_int)ip6_maxfragpackets)
+ if (ip6_maxfragpackets >= 0 &&
+ frag6_nfragpackets >= (u_int)ip6_maxfragpackets)
goto dropfrag;
frag6_nfragpackets++;
q6 = malloc(sizeof(*q6), M_FTABLE, M_NOWAIT | M_ZERO);
