new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 9197a1b..0ddbece 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -3004,7 +3004,7 @@
  */
 int jfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 {
-	struct inode *ip = filp->f_path.dentry->d_inode;
+	struct inode *ip = file_inode(filp);
 	struct nls_table *codepage = JFS_SBI(ip->i_sb)->nls_tab;
 	int rc = 0;
 	loff_t dtpos;	/* legacy OS/2 style position */