vfs: mnt_ns moved to struct mount

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/dcache.c b/fs/dcache.c
index 2479004..9791b1e 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2503,7 +2503,7 @@
 	if (!slash)
 		error = prepend(buffer, buflen, "/", 1);
 	if (!error)
-		error = vfsmnt->mnt_ns ? 1 : 2;
+		error = real_mount(vfsmnt)->mnt_ns ? 1 : 2;
 	goto out;
 }