RDMA/bnxt_re: Remove set but not used variables 'pg' and 'idx'

RDMA/bnxt_re: Remove set but not used variables 'pg' and 'idx'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/infiniband/hw/bnxt_re/qplib_rcfw.c: In function '__send_message':
drivers/infiniband/hw/bnxt_re/qplib_rcfw.c:101:10: warning:
 variable 'idx' set but not used [-Wunused-but-set-variable]
drivers/infiniband/hw/bnxt_re/qplib_rcfw.c:101:6: warning:
 variable 'pg' set but not used [-Wunused-but-set-variable]

commit cee0c7bba486 ("RDMA/bnxt_re: Refactor command queue management
code") involved this, but not used.

Link: https://lore.kernel.org/r/20200227064900.92255-1-yuehaibing@huawei.com
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>