[NET]: Use NIP6_FMT in kernel.h

There are errors and inconsistency in the display of NIP6 strings.
	ie: net/ipv6/ip6_flowlabel.c

There are errors and inconsistency in the display of NIPQUAD strings too.
	ie: net/netfilter/nf_conntrack_ftp.c

This patch:
	adds NIP6_FMT to kernel.h
	changes all code to use NIP6_FMT
	fixes net/ipv6/ip6_flowlabel.c
	adds NIPQUAD_FMT to kernel.h
	fixes net/netfilter/nf_conntrack_ftp.c
	changes a few uses of "%u.%u.%u.%u" to NIPQUAD_FMT for symmetry to NIP6_FMT

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 557a7d9..477d7f8 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -1036,14 +1036,14 @@
 		if (from_addr.sa.sa_family == AF_INET6) {
 			printk(KERN_WARNING
 			       "%s association %p could not find address "
-			       "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+			       NIP6_FMT "\n",
 			       __FUNCTION__,
 			       asoc,
 			       NIP6(from_addr.v6.sin6_addr));
 		} else {
 			printk(KERN_WARNING
 			       "%s association %p could not find address "
-			       "%u.%u.%u.%u\n",
+			       NIPQUAD_FMT "\n",
 			       __FUNCTION__,
 			       asoc,
 			       NIPQUAD(from_addr.v4.sin_addr.s_addr));