IB/mlx4: Adjust duplicate test

Author: Julia Lawall <Julia.Lawall@lip6.fr>

Delete successive tests to the same location.  The code tested the result
of a previous allocation, that itself was already tested.  It is changed to
test the result of the most recent allocation.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// 
@s exists@
local idexpression y;
expression x,e;
@@

*if ( \(x == NULL\|IS_ERR(x)\|y != 0\) )
 { ... when forall
   return ...; }
... when != \(y = e\|y += e\|y -= e\|y |= e\|y &= e\|y++\|y--\|&y\)
    when != \(XT_GETPAGE(...,y)\|WMI_CMD_BUF(...)\)
*if ( \(x == NULL\|IS_ERR(x)\|y != 0\) )
 { ... when forall
   return ...; }
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Roland Dreier 

---
 drivers/infiniband/hw/mlx4/sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/infiniband/hw/mlx4/sysfs.c b/drivers/infiniband/hw/mlx4/sysfs.c
index 5b2a01d..97516eb 100644
--- a/drivers/infiniband/hw/mlx4/sysfs.c
+++ b/drivers/infiniband/hw/mlx4/sysfs.c
@@ -732,7 +732,7 @@ int mlx4_ib_device_register_sysfs(struct mlx4_ib_dev *dev)
 	dev->ports_parent =
 		kobject_create_and_add("ports",
 				       kobject_get(dev->iov_parent));
-	if (!dev->iov_parent) {
+	if (!dev->ports_parent) {
 		ret = -ENOMEM;
 		goto err_ports;
 	}