net/smc: remove unused input parameters in smc_buf_get_slot

The input parameter "compressed_bufsize" of smc_buf_get_slot is unused,
remove it.

Signed-off-by: Wang Liang <wangliang74@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250618103342.1423913-1-wangliang74@huawei.com


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