RDMA/restrack: Don't treat as an error allocation ID wrapping

stable inclusion
from stable-5.10.9
commit 35694924a60a543d5c0840a57a16856f3f23653c
bugzilla: 47457

--------------------------------

commit 3c638cdb upstream.

xa_alloc_cyclic() call returns positive number if ID allocation
succeeded but wrapped. It is not an error, so normalize the "ret"
variable to zero as marker of not-an-error.

   drivers/infiniband/core/restrack.c:261 rdma_restrack_add()
   warn: 'ret' can be either negative or positive

Fixes: fd47c2f9 ("RDMA/restrack: Convert internal DB from hash to XArray")
Link: https://lore.kernel.org/r/20201216100753.1127638-1-leon@kernel.org


Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>