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.devSigned-off-by: NZhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>