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/tcp_output.c b/net/ipv4/tcp_output.c
index 7979bfd..1a63082 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -34,6 +34,8 @@
  *
  */
 
+#define pr_fmt(fmt) "TCP: " fmt
+
 #include <net/tcp.h>
 
 #include <linux/compiler.h>
@@ -2415,7 +2417,7 @@
 
 	skb = tcp_write_queue_head(sk);
 	if (skb == NULL || !(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)) {
-		printk(KERN_DEBUG "tcp_send_synack: wrong queue state\n");
+		pr_debug("%s: wrong queue state\n", __func__);
 		return -EFAULT;
 	}
 	if (!(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_ACK)) {