RDMA/rxe: Fix incorrect TASKLET_STATE_SCHED check in rxe_task.c

RDMA/rxe: Fix incorrect TASKLET_STATE_SCHED check in rxe_task.c

In a previous patch TASKLET_STATE_SCHED was used as a mask but it is a bit
position instead. Add the missing shift.

Link: https://lore.kernel.org/r/20230329193308.7489-1-rpearsonhpe@gmail.com
Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/linux-rdma/8a054b78-6d50-4bc6-8d8a-83f85fbdb82f@kili.mountain/
Fixes: d94671632572 ("RDMA/rxe: Rewrite rxe_task.c")
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>