tlan: add cast needed for proper 64 bit operation

Changes this beauty into a statement that actually has an effect on amd64.

Tested-by: Per Jessen <per@opensuse.org>
Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed