ecryptfs: super: Fix formatting, naming and kernel-doc abuses

Fixes the following W=1 kernel build warning(s):

 fs/ecryptfs/super.c:22: warning: cannot understand function prototype: 'struct kmem_cache *ecryptfs_inode_info_cache; '
 fs/ecryptfs/super.c:91: warning: Function parameter or member 'dentry' not described in 'ecryptfs_statfs'
 fs/ecryptfs/super.c:91: warning: Excess function parameter 'sb' description in 'ecryptfs_statfs'
 fs/ecryptfs/super.c:120: warning: Function parameter or member 'inode' not described in 'ecryptfs_evict_inode'
 fs/ecryptfs/super.c:133: warning: Function parameter or member 'm' not described in 'ecryptfs_show_options'
 fs/ecryptfs/super.c:133: warning: Function parameter or member 'root' not described in 'ecryptfs_show_options'

Cc: Tyler Hicks <code@tyhicks.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: "Michael C. Thompson" <mcthomps@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>

fs/ecryptfs/super.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
-/**
+/*
  * eCryptfs: Linux filesystem encryption layer
  *
  * Copyright (C) 1997-2003 Erez Zadok
@@ -81,7 +81,7 @@ static void ecryptfs_destroy_inode(struct inode *inode)
 
 /**
  * ecryptfs_statfs
- * @sb: The ecryptfs super block
+ * @dentry: The ecryptfs dentry
  * @buf: The struct kstatfs to fill in with stats
  *
  * Get the filesystem statistics. Currently, we let this pass right through
@@ -108,7 +108,7 @@ static int ecryptfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 
 /**
  * ecryptfs_evict_inode
- * @inode - The ecryptfs inode
+ * @inode: The ecryptfs inode
  *
  * Called by iput() when the inode reference count reached zero
  * and the inode is not hashed anywhere.  Used to clear anything
@@ -123,7 +123,7 @@ static void ecryptfs_evict_inode(struct inode *inode)
 	iput(ecryptfs_inode_to_lower(inode));
 }
 
-/**
+/*
  * ecryptfs_show_options
  *
  * Prints the mount options for a given superblock.