[PATCH 1/2 net-next] mlxsw: spectrum: Fix check for IS_ERR() instead of NULL

[Dan Carpenter]

mlxsw_afa_block_create() doesn't return error pointers, it returns NULL
on error.

Fixes: 0e14c7777acb ("mlxsw: spectrum: Add the multicast routing hardware 
logic")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr_tcam.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr_tcam.c
index cda9e9ad10e3..5e4ccbf17e3d 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr_tcam.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr_tcam.c
@@ -239,8 +239,8 @@ mlxsw_sp_mr_tcam_afa_block_create(struct mlxsw_sp *mlxsw_sp,
        int err;
 
        afa_block = mlxsw_afa_block_create(mlxsw_sp->afa);
-       if (IS_ERR(afa_block))
-               return afa_block;
+       if (!afa_block)
+               return ERR_PTR(-ENOMEM);
 
        err = mlxsw_afa_block_append_counter(afa_block, counter_index);
        if (err)