RDMA/rxe: Remove redundant scheduling of rxe_completer

In rxe_post_send_kernel() if the qp is in the error state after posting
the work requests the rxe_completer() task is scheduled.

But, the only way to move the qp into the error state is to call
rxe_qp_error() which also schedules the rxe_completer() task to drain the
queues. Calling it a second time has no effect. This commit removes the
redundant call.

Link: https://lore.kernel.org/r/20240329145513.35381-6-rpearsonhpe@gmail.comSigned-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe_verbs.c

@@ -907,11 +907,6 @@ static int rxe_post_send_kernel(struct rxe_qp *qp,
 	if (good)
 		rxe_sched_task(&qp->req.task);
 
-	spin_lock_irqsave(&qp->state_lock, flags);
-	if (qp_state(qp) == IB_QPS_ERR)
-		rxe_sched_task(&qp->comp.task);
-	spin_unlock_irqrestore(&qp->state_lock, flags);
-
 	return err;
 }