ubifs: Remove ineffective function ubifs_evict_xattr_inode()

Function ubifs_evict_xattr_inode() is imported by commit 272eda8298dc
("ubifs: Correctly evict xattr inodes") to reclaim xattr inode when
the host inode is deleted.
The xattr inode is evicted in the host inode deleting process since
commit 7959cf3a7506 ("ubifs: journal: Handle xattrs like files").
So the ineffective function ubifs_evict_xattr_inode() can be deleted
safely.

Signed-off-by: Zhihao Cheng <[e-mail]>
Signed-off-by: Richard Weinberger <[e-mail]>

fs/ubifs/tnc.c

···
 		dbg_tnc("xent '%s', ino %lu", xent->name,
 			(unsigned long)xattr_inum);
 
-		ubifs_evict_xattr_inode(c, xattr_inum);
-
 		fname_name(&nm) = xent->name;
 		fname_len(&nm) = le16_to_cpu(xent->nlen);
 		err = ubifs_tnc_remove_nm(c, &key1, &nm);

fs/ubifs/ubifs.h

···
 #ifdef CONFIG_UBIFS_FS_XATTR
 extern const struct xattr_handler * const ubifs_xattr_handlers[];
 ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size);
-void ubifs_evict_xattr_inode(struct ubifs_info *c, ino_t xattr_inum);
 int ubifs_purge_xattrs(struct inode *host);
 #else
 #define ubifs_listxattr NULL
 #define ubifs_xattr_handlers NULL
-static inline void ubifs_evict_xattr_inode(struct ubifs_info *c,
-					   ino_t xattr_inum) { }
 static inline int ubifs_purge_xattrs(struct inode *host)
 {
 	return 0;

fs/ubifs/xattr.c

···
 	return err;
 }
 
-/**
- * ubifs_evict_xattr_inode - Evict an xattr inode.
- * @c: UBIFS file-system description object
- * @xattr_inum: xattr inode number
- *
- * When an inode that hosts xattrs is being removed we have to make sure
- * that cached inodes of the xattrs also get removed from the inode cache
- * otherwise we'd waste memory. This function looks up an inode from the
- * inode cache and clears the link counter such that iput() will evict
- * the inode.
- */
-void ubifs_evict_xattr_inode(struct ubifs_info *c, ino_t xattr_inum)
-{
-	struct inode *inode;
-
-	inode = ilookup(c->vfs_sb, xattr_inum);
-	if (inode) {
-		clear_nlink(inode);
-		iput(inode);
-	}
-}
-
 static int ubifs_xattr_remove(struct inode *host, const char *name)
 {
 	struct inode *inode;