We had a few places wr_cqe is not set, which could lead to NULL pointer
deref or GPF in error case.

Fixes: 9cb83748 ("RDMA/rtrs: server: main functionality")
Link: https://lore.kernel.org/r/20201217141915.56989-14-jinpu.wang@cloud.ionos.comSigned-off-by: NJack Wang <jinpu.wang@cloud.ionos.com>
Reviewed-by: NMd Haris Iqbal <haris.iqbal@cloud.ionos.com>
Signed-off-by: NGuoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>