new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index 06ea69b..280ded8 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -119,7 +119,7 @@
 
 static int hypfs_open(struct inode *inode, struct file *filp)
 {
-	char *data = filp->f_path.dentry->d_inode->i_private;
+	char *data = file_inode(filp)->i_private;
 	struct hypfs_sb_info *fs_info;
 
 	if (filp->f_mode & FMODE_WRITE) {