new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/tomoyo/securityfs_if.c b/security/tomoyo/securityfs_if.c
index 8592f2fc..fcf3278 100644
--- a/security/tomoyo/securityfs_if.c
+++ b/security/tomoyo/securityfs_if.c
@@ -135,7 +135,7 @@
  */
 static int tomoyo_open(struct inode *inode, struct file *file)
 {
-	const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
+	const int key = ((u8 *) file_inode(file)->i_private)
 		- ((u8 *) NULL);
 	return tomoyo_open_control(key, file);
 }