infiniband: ipoib: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value. The function can work or not, but the code logic should
never do something different based on this.

Signed-off-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Jason Gunthorpe <[e-mail]>

drivers/infiniband/ulp/ipoib/ipoib.h

···
 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 void ipoib_create_debug_files(struct net_device *dev);
 void ipoib_delete_debug_files(struct net_device *dev);
-int ipoib_register_debugfs(void);
+void ipoib_register_debugfs(void);
 void ipoib_unregister_debugfs(void);
 #else
 static inline void ipoib_create_debug_files(struct net_device *dev) { }
 static inline void ipoib_delete_debug_files(struct net_device *dev) { }
-static inline int ipoib_register_debugfs(void) { return 0; }
+static inline void ipoib_register_debugfs(void) { }
 static inline void ipoib_unregister_debugfs(void) { }
 #endif
 

drivers/infiniband/ulp/ipoib/ipoib_fs.c

···
 	snprintf(name, sizeof(name), "%s_mcg", dev->name);
 	priv->mcg_dentry = debugfs_create_file(name, S_IFREG | S_IRUGO,
 					       ipoib_root, dev, &ipoib_mcg_fops);
-	if (!priv->mcg_dentry)
-		ipoib_warn(priv, "failed to create mcg debug file\n");
 
 	snprintf(name, sizeof(name), "%s_path", dev->name);
 	priv->path_dentry = debugfs_create_file(name, S_IFREG | S_IRUGO,
 						ipoib_root, dev, &ipoib_path_fops);
-	if (!priv->path_dentry)
-		ipoib_warn(priv, "failed to create path debug file\n");
 }
 
 void ipoib_delete_debug_files(struct net_device *dev)
···
 	priv->mcg_dentry = priv->path_dentry = NULL;
 }
 
-int ipoib_register_debugfs(void)
+void ipoib_register_debugfs(void)
 {
 	ipoib_root = debugfs_create_dir("ipoib", NULL);
-	return ipoib_root ? 0 : -ENOMEM;
 }
 
 void ipoib_unregister_debugfs(void)

drivers/infiniband/ulp/ipoib/ipoib_main.c

···
 	 */
 	BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
 
-	ret = ipoib_register_debugfs();
-	if (ret)
-		return ret;
+	ipoib_register_debugfs();
 
 	/*
 	 * We create a global workqueue here that is used for all flush