bonding: remove redundant NULL check in debugfs function

Because debugfs_create_dir returns ERR_PTR, so bonding_debug_root will
never be NULL. Remove redundant NULL check for bonding_debug_root in
debugfs function. The later debugfs_create_dir/debugfs_remove_recursive
/debugfs_remove_recursive functions will check the dentry with IS_ERR().
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_debugfs.c

@@ -49,9 +49,6 @@ DEFINE_SHOW_ATTRIBUTE(bond_debug_rlb_hash);
 
 void bond_debug_register(struct bonding *bond)
 {
-	if (!bonding_debug_root)
-		return;
-
 	bond->debug_dir =
 		debugfs_create_dir(bond->dev->name, bonding_debug_root);
 
@@ -61,9 +58,6 @@ void bond_debug_register(struct bonding *bond)
 
 void bond_debug_unregister(struct bonding *bond)
 {
-	if (!bonding_debug_root)
-		return;
-
 	debugfs_remove_recursive(bond->debug_dir);
 }
 
@@ -71,9 +65,6 @@ void bond_debug_reregister(struct bonding *bond)
 {
 	struct dentry *d;
 
-	if (!bonding_debug_root)
-		return;
-
 	d = debugfs_rename(bonding_debug_root, bond->debug_dir,
 			   bonding_debug_root, bond->dev->name);
 	if (!IS_ERR(d)) {