packet: fix typo in packet_mmap.txt

Just fixed typo of sample code in packet_mmap.txt

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/Documentation/networking/packet_mmap.txt b/Documentation/networking/packet_mmap.txt
index 4acea66..1c08a4b 100644
--- a/Documentation/networking/packet_mmap.txt
+++ b/Documentation/networking/packet_mmap.txt
@@ -155,7 +155,7 @@
 
  /* fill sockaddr_ll struct to prepare binding */
  my_addr.sll_family = AF_PACKET;
- my_addr.sll_protocol = ETH_P_ALL;
+ my_addr.sll_protocol = htons(ETH_P_ALL);
  my_addr.sll_ifindex =  s_ifr.ifr_ifindex;
 
  /* bind socket to eth0 */