RDMA/usnic: Fix memleak in find_free_vf_and_create_qp_grp

If usnic_ib_qp_grp_create() fails at the first call, dev_list
will not be freed on error, which leads to memleak.

Fixes: e3cf00d0 ("IB/usnic: Add Cisco VIC low-level hardware driver")
Link: https://lore.kernel.org/r/20201226074248.2893-1-dinghao.liu@zju.edu.cnSigned-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/usnic/usnic_ib_verbs.c

@@ -214,6 +214,7 @@ find_free_vf_and_create_qp_grp(struct usnic_ib_dev *us_ibdev,
 
 		}
 		usnic_uiom_free_dev_list(dev_list);
+		dev_list = NULL;
 	}
 
 	/* Try to find resources on an unused vf */
@@ -239,6 +240,8 @@ find_free_vf_and_create_qp_grp(struct usnic_ib_dev *us_ibdev,
 qp_grp_check:
 	if (IS_ERR_OR_NULL(qp_grp)) {
 		usnic_err("Failed to allocate qp_grp\n");
+		if (usnic_ib_share_vf)
+			usnic_uiom_free_dev_list(dev_list);
 		return ERR_PTR(qp_grp ? PTR_ERR(qp_grp) : -ENOMEM);
 	}
 	return qp_grp;