RDMA/siw: Remove unnecessary kthread create/destroy printouts

There is already a warning if we cannot start any thread, and stopping
those threads is not worth spamming the console.

This also corrects a warning from gcc:

 drivers/infiniband/sw/siw/siw_main.c: In function 'siw_create_tx_threads':
 drivers/infiniband/sw/siw/siw_main.c:91:11: warning:
  variable 'rv' set but not used [-Wunused-but-set-variable]
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/sw/siw/siw_main.c

@@ -88,7 +88,7 @@ static void siw_device_cleanup(struct ib_device *base_dev)
 
 static int siw_create_tx_threads(void)
 {
-	int cpu, rv, assigned = 0;
+	int cpu, assigned = 0;
 
 	for_each_online_cpu(cpu) {
 		/* Skip HT cores */
@@ -99,9 +99,7 @@ static int siw_create_tx_threads(void)
 			kthread_create(siw_run_sq, (unsigned long *)(long)cpu,
 				       "siw_tx/%d", cpu);
 		if (IS_ERR(siw_tx_thread[cpu])) {
-			rv = PTR_ERR(siw_tx_thread[cpu]);
 			siw_tx_thread[cpu] = NULL;
-			pr_info("Creating TX thread for CPU %d failed", cpu);
 			continue;
 		}
 		kthread_bind(siw_tx_thread[cpu], cpu);

drivers/infiniband/sw/siw/siw_qp_tx.c

@@ -1201,8 +1201,6 @@ int siw_run_sq(void *data)
 	init_llist_head(&tx_task->active);
 	init_waitqueue_head(&tx_task->waiting);
 
-	pr_info("Started siw TX thread on CPU %u\n", nr_cpu);
-
 	while (1) {
 		struct llist_node *fifo_list = NULL;
 
@@ -1240,8 +1238,6 @@ int siw_run_sq(void *data)
 			siw_sq_resume(qp);
 		}
 	}
-	pr_info("Stopped siw TX thread on CPU %u\n", nr_cpu);
-
 	return 0;
 }