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/ipv4/ah4.c b/net/ipv4/ah4.c
index 3a28075..e8f2617 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -406,8 +406,8 @@
 			      ah->spi, IPPROTO_AH, AF_INET);
 	if (!x)
 		return;
-	printk(KERN_DEBUG "pmtu discovery on SA AH/%08x/%08x\n",
-	       ntohl(ah->spi), ntohl(iph->daddr));
+	pr_debug("pmtu discovery on SA AH/%08x/%08x\n",
+		 ntohl(ah->spi), ntohl(iph->daddr));
 	xfrm_state_put(x);
 }