new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/isofs/dir.c b/fs/isofs/dir.c
index f20437c..a7d5c3c 100644
--- a/fs/isofs/dir.c
+++ b/fs/isofs/dir.c
@@ -253,7 +253,7 @@
 	int result;
 	char *tmpname;
 	struct iso_directory_record *tmpde;
-	struct inode *inode = filp->f_path.dentry->d_inode;
+	struct inode *inode = file_inode(filp);
 
 	tmpname = (char *)__get_free_page(GFP_KERNEL);
 	if (tmpname == NULL)