[PATCH -next] IB/qib: Add missing err handle for qib_user_sdma_rb_insert

[YueHaibing]

It should goto err handle if qib_user_sdma_rb_insert fails,
other than success return.

Fixes: 67810e8c3c01 ("RDMA/qib: Remove all occurrences of BUG_ON()")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/infiniband/hw/qib/qib_user_sdma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/hw/qib/qib_user_sdma.c 
b/drivers/infiniband/hw/qib/qib_user_sdma.c
index 31c523b..e87c0a7 100644
--- a/drivers/infiniband/hw/qib/qib_user_sdma.c
+++ b/drivers/infiniband/hw/qib/qib_user_sdma.c
@@ -237,6 +237,8 @@ qib_user_sdma_queue_create(struct device *dev, int unit, 
int ctxt, int sctxt)
 
                ret = qib_user_sdma_rb_insert(&qib_user_sdma_rb_root,
                                        sdma_rb_node);
+               if (ret == 0)
+                       goto err_rb;
        }
        pq->sdma_rb_node = sdma_rb_node;
 
-- 
2.7.0