RDMA/hns: Fix the wrong type of return value of the interrupt handler

The type of return value of the interrupt handler should be irqreturn_t.

Link: https://lore.kernel.org/r/20220714134353.16700-3-liangwenpeng@huawei.com


Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>