[PATCH] RDMA/siw: Print error code while kthread_create failed

[YueHaibing]

In iw_create_tx_threads(), if we failed to create kthread,
we should print the 'rv', this fix gcc warning:

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 <hul...@huawei.com>
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/infiniband/sw/siw/siw_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/sw/siw/siw_main.c 
b/drivers/infiniband/sw/siw/siw_main.c
index fd2552a..2a70830d 100644
--- a/drivers/infiniband/sw/siw/siw_main.c
+++ b/drivers/infiniband/sw/siw/siw_main.c
@@ -101,7 +101,8 @@ static int siw_create_tx_threads(void)
                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);
+                       pr_info("Creating TX thread for CPU%d failed %d\n",
+                               cpu, rv);
                        continue;
                }
                kthread_bind(siw_tx_thread[cpu], cpu);
-- 
2.7.4