[PATCH] c2port: checking for NULL instead of IS_ERR()

[Dan Carpenter]

c2port_device_register() never returns NULL, it uses error pointers.

Fixes: 65131cd52b9e ("c2port: add c2port support for Eurotech Duramar 2150")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/misc/c2port/c2port-duramar2150.c 
b/drivers/misc/c2port/c2port-duramar2150.c
index 5484301d57d9..3dc61ea7dc64 100644
--- a/drivers/misc/c2port/c2port-duramar2150.c
+++ b/drivers/misc/c2port/c2port-duramar2150.c
@@ -129,8 +129,8 @@ static int __init duramar2150_c2port_init(void)
 
        duramar2150_c2port_dev = c2port_device_register("uc",
                                        &duramar2150_c2port_ops, NULL);
-       if (!duramar2150_c2port_dev) {
-               ret = -ENODEV;
+       if (IS_ERR(duramar2150_c2port_dev)) {
+               ret = PTR_ERR(duramar2150_c2port_dev);
                goto free_region;
        }