[patch] [SCSI] target: allow release() to be called on NULL

[Dan Carpenter <error27@gmail.com>]

This is a cleanup and not a bugfix.

container_of() does pointer math and the result of that math can
basically not be NULL here so "se_dev" is non-NULL.

Normally release() type functions accept a NULL parameter.  I don't
think target_core_dev_release() is ever called with a NULL parameter but
it's a cleaner to allow that.

So instead of checking "se_dev", I've changed it to check "item".

Signed-off-by: Dan Carpenter <error27@gmail.com>

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 2764510..d9dcd9d 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -1973,7 +1973,7 @@ static void target_core_dev_release(struct config_item *item)
 				struct se_subsystem_dev, se_dev_group);
 	struct config_group *dev_cg;
 
-	if (!(se_dev))
+	if (!item)
 		return;
 
 	dev_cg = &se_dev->se_dev_group;