hppfs can use existing proc_mnt, no need for do_kern_mount() in there

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/hppfs/hppfs.c b/fs/hppfs/hppfs.c
index 7239efc..2e4dfa8 100644
--- a/fs/hppfs/hppfs.c
+++ b/fs/hppfs/hppfs.c
@@ -718,7 +718,7 @@
 	struct vfsmount *proc_mnt;
 	int err = -ENOENT;
 
-	proc_mnt = do_kern_mount("proc", 0, "proc", NULL);
+	proc_mnt = mntget(current->nsproxy->pid_ns->proc_mnt);
 	if (IS_ERR(proc_mnt))
 		goto out;