RDMA/hfi1: Remove the unneeded result variable

Return the value set_link_state() directly instead of storing it in
another redundant variable.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Link: https://lore.kernel.org/r/20220901074209.313004-1-ye.xingchen@zte.com.cn


Signed-off-by: Leon Romanovsky <leon@kernel.org>