new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/s390/hypfs/hypfs_dbfs.c b/arch/s390/hypfs/hypfs_dbfs.c
index 13e76da..9fd4a40 100644
--- a/arch/s390/hypfs/hypfs_dbfs.c
+++ b/arch/s390/hypfs/hypfs_dbfs.c
@@ -54,7 +54,7 @@
 	if (*ppos != 0)
 		return 0;
 
-	df = file->f_path.dentry->d_inode->i_private;
+	df = file_inode(file)->i_private;
 	mutex_lock(&df->lock);
 	if (!df->data) {
 		data = hypfs_dbfs_data_alloc(df);