[IPV6] sit: Add missing MODULE_LICENSE

This is missing the MODULE_LICENSE statements and taints the kernel
upon loading. License is obvious from the beginning of the file.

Signed-off-by: Jan Dittmer <jdi@l4x.org>
Signed-off-by: Joerg Roedel <joro-lkml@zlug.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index dc5765b..b481a4d 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -853,3 +853,4 @@
 
 module_init(sit_init);
 module_exit(sit_cleanup);
+MODULE_LICENSE("GPL");