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

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

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

Fixes: 74004262f329 ("MicroSemi Switchtec management interface driver")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index fcde98161d9a..cc6e085008fb 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -608,7 +608,7 @@ static int switchtec_dev_open(struct inode *inode, struct file *filp)
 	stdev = container_of(inode->i_cdev, struct switchtec_dev, cdev);
 
 	stuser = stuser_create(stdev);
-	if (!stuser)
+	if (IS_ERR(stuser))
 		return PTR_ERR(stuser);
 
 	filp->private_data = stuser;