RDMA/core: Free DIM memory in error unwind

The memory allocated for the DIM wasn't freed in in error unwind path, fix
it by calling to rdma_dim_destroy().

Fixes: da662979 ("RDMA/core: Provide RDMA DIM support for ULPs")
Link: https://lore.kernel.org/r/20200730082719.1582397-4-leon@kernel.orgSigned-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Max Gurtovoy &lt;maxg@mellanox.com <mailto:maxg@mellanox.com&gt;>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/core/cq.c

@@ -275,6 +275,7 @@ struct ib_cq *__ib_alloc_cq_user(struct ib_device *dev, void *private,
 	return cq;
 
 out_destroy_cq:
+	rdma_dim_destroy(cq);
 	rdma_restrack_del(&cq->res);
 	cq->device->ops.destroy_cq(cq, udata);
 out_free_wc: