SMACK support for mkiss

SMACK (Stuttgart Modified Amateurradio CRC KISS) is a KISS variant that uses CRC16 checksums to secure data transfers between the modem and host. It's also used to communicate over a pty to applications such as Wampes.

Patches for Linux 2.4 by Thomas Osterried DL9SAU, upgraded to the latest mkiss 2.6 mkiss driver by me.

 drivers/net/hamradio/Kconfig |    1 
 drivers/net/hamradio/mkiss.c |  178 +++++++++++++++++++++++++++++++++++--------
 2 files changed, 148 insertions(+), 31 deletions(-)

Index: net-git/drivers/net/hamradio/Kconfig
===================================================================
@@ -1,6 +1,7 @@
 config MKISS
 	tristate "Serial port KISS driver"
 	depends on AX25
+	select CRC16
 	---help---
 	  KISS is a protocol used for the exchange of data between a computer
 	  and a Terminal Node Controller (a small embedded system commonly

applied