RDMA/bnxt_re: Remove set but not used variable 'qplib_ctx'

drivers/infiniband/hw/bnxt_re/main.c:1012:25:
 warning: variable ‘qplib_ctx’ set but not used [-Wunused-but-set-variable]

Fixes: f86b31c6

 ("RDMA/bnxt_re: Static NQ depth allocation")
Link: https://lore.kernel.org/r/20200905121624.32776-1-yuehaibing@huawei.com
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>