RDMA: Clean destroy CQ in drivers do not return errors

Like all other destroy commands, .destroy_cq() call is not supposed
to fail. In all flows, the attempt to return earlier caused to memory
leaks.

This patch converts .destroy_cq() to do not return any errors.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Acked-by: Gal Pressman <galpress@amazon.com>
Acked-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx5/cq.c

@@ -998,7 +998,7 @@ err_create:
 	return ERR_PTR(err);
 }
 
-int mlx5_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
+void mlx5_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
 {
 	struct mlx5_ib_dev *dev = to_mdev(cq->device);
 	struct mlx5_ib_cq *mcq = to_mcq(cq);
@@ -1010,8 +1010,6 @@ int mlx5_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
 		destroy_cq_kernel(dev, mcq);
 
 	kfree(mcq);
-
-	return 0;
 }
 
 static int is_equal_rsn(struct mlx5_cqe64 *cqe64, u32 rsn)