RDMA/rxe: Set pd early in mr alloc routines

RDMA/rxe: Set pd early in mr alloc routines

Move setting of pd in mr objects ahead of any possible errors so that it
will always be set in rxe_mr_cleanup() to avoid seg faults when
rxe_put(mr_pd(mr)) is called.

Fixes: cf40367961d8 ("RDMA/rxe: Move mr cleanup code to rxe_mr_cleanup()")
Link: https://lore.kernel.org/r/20220805183153.32007-2-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>