net: ipv4 and ipv6: Convert printk(KERN_DEBUG to pr_debug

Use the current debugging style and enable dynamic_debug.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 6697eb0..1e62b755 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -444,8 +444,8 @@
 			      esph->spi, IPPROTO_ESP, AF_INET6);
 	if (!x)
 		return;
-	printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/%pI6\n",
-			ntohl(esph->spi), &iph->daddr);
+	pr_debug("pmtu discovery on SA ESP/%08x/%pI6\n",
+		 ntohl(esph->spi), &iph->daddr);
 	xfrm_state_put(x);
 }