vfs: live vfsmounts never have NULL ->mnt_sb

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index 0a4613d..783fde7 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -264,7 +264,7 @@
 		return -EINVAL;
 	}
 
-	if (usbfs_mount && usbfs_mount->mnt_sb)
+	if (usbfs_mount)
 		update_sb(usbfs_mount->mnt_sb);
 
 	return 0;
@@ -500,9 +500,8 @@
 	 * have around.
 	 */
 	if (!parent ) {
-		if (usbfs_mount && usbfs_mount->mnt_sb) {
+		if (usbfs_mount)
 			parent = usbfs_mount->mnt_root;
-		}
 	}
 
 	if (!parent) {