net/smc: delete pointless divide by one

Here "buf" is a void pointer so sizeof(*buf) is one.  Doing a divide
by one makes the code less readable.  Delete it.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Link: https://patch.msgid.link/ee1a790b-f874-4512-b3ae-9c45f99dc640@stanley.mountain


Signed-off-by: Jakub Kicinski <kuba@kernel.org>