target: Remove unused su_group usage in fabric register/dergister

This patch removes two instances of left over v3.x code performing local
scope access to struct target_core_fabric_ops->tf_subsys->su_group in
target_fabric_configfs_register() and target_fabric_configfs_deregister().

Reported-by: Christophe Fergeau <cfergeau@gmail.com>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_configfs.c

@@ -533,7 +533,6 @@ static int target_fabric_tf_ops_check(
 int target_fabric_configfs_register(
 	struct target_fabric_configfs *tf)
 {
-	struct config_group *su_group;
 	int ret;
 
 	if (!(tf)) {
@@ -546,12 +545,6 @@ int target_fabric_configfs_register(
 			" pointer\n");
 		return -EINVAL;
 	}
-	su_group = &tf->tf_subsys->su_group;
-	if (!(su_group)) {
-		printk(KERN_ERR "Unable to locate target struct config_group"
-			" pointer\n");
-		return -EINVAL;
-	}
 	ret = target_fabric_tf_ops_check(tf);
 	if (ret < 0)
 		return ret;
@@ -565,7 +558,6 @@ EXPORT_SYMBOL(target_fabric_configfs_register);
 void target_fabric_configfs_deregister(
 	struct target_fabric_configfs *tf)
 {
-	struct config_group *su_group;
 	struct configfs_subsystem *su;
 
 	if (!(tf)) {
@@ -579,13 +571,6 @@ void target_fabric_configfs_deregister(
 			" pointer\n");
 		return;
 	}
-	su_group = &tf->tf_subsys->su_group;
-	if (!(su_group)) {
-		printk(KERN_ERR "Unable to locate target struct config_group"
-			" pointer\n");
-		return;
-	}
-
 	printk(KERN_INFO "<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>"
 			">>>>>>>>>>>>\n");
 	mutex_lock(&g_tf_lock);