RDMA/irdma: Change returned type of irdma_setup_virt_qp to void

Since the returned value of the function irdma_setup_virt_qp is always 0,
remove the returned value check and change the returned type to void.

Link: https://lore.kernel.org/r/20210714031130.1511109-4-yanjun.zhu@linux.dev


Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>