don't bother with ->d_inode->i_sb - it's always equal to ->d_sb

... and neither can ever be NULL

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 3cf1c59..d6709eb 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -367,7 +367,7 @@
 	inode_unlock(d_backing_inode(parent->dentry));
 	if (d_is_positive(d)) {
 		/* update watch filter fields */
-		watch->dev = d_backing_inode(d)->i_sb->s_dev;
+		watch->dev = d->d_sb->s_dev;
 		watch->ino = d_backing_inode(d)->i_ino;
 	}
 	dput(d);