LINKTYPE_NFLOG: Fix size of hardware address structure padding.

It is two octets, not one octet, to pad to a 32-bit boundary. That
matches observed captures, and also see:

https://github.com/torvalds/linux/blob/master/include/uapi/linux/netfilter/nfnetlink_log.h#L27

https://github.com/the-tcpdump-group/libpcap/blob/master/pcap/nflog.h#L64

Signed-off-by: John Thacker <johnthacker@gmail.com>

Author: johnthacker

htmlsrc/linktypes/LINKTYPE_NFLOG.html

@@ -112,7 +112,7 @@ <h3 class="subtitle">Description</h3>
 |           (2 Octets)          |
 +-------------------------------+
 |             Padding           |
-|            (1 Octet)          |
+|           (2 Octets)          |
 +-------------------------------+
 |            Address            |
 | (8 Octets, including padding) |

linktypes/LINKTYPE_NFLOG.html

@@ -156,7 +156,7 @@ <h3 class="subtitle">Description</h3>
 |           (2 Octets)          |
 +-------------------------------+
 |             Padding           |
-|            (1 Octet)          |
+|           (2 Octets)          |
 +-------------------------------+
 |            Address            |
 | (8 Octets, including padding) |