new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/s390/char/vmur.c b/drivers/s390/char/vmur.c
index 483f72b..c180e31 100644
--- a/drivers/s390/char/vmur.c
+++ b/drivers/s390/char/vmur.c
@@ -703,7 +703,7 @@
 	 * We treat the minor number as the devno of the ur device
 	 * to find in the driver tree.
 	 */
-	devno = MINOR(file->f_dentry->d_inode->i_rdev);
+	devno = MINOR(file_inode(file)->i_rdev);
 
 	urd = urdev_get_from_devno(devno);
 	if (!urd) {