kill proc_ns completely

procfs inodes need only the ns_ops part; nsfs inodes don't need it at all

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 0fabc48..d689fd6 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -57,11 +57,6 @@
 		struct task_struct *task);
 };
 
-struct proc_ns {
-	struct ns_common *ns;
-	const struct proc_ns_operations *ns_ops;
-};
-
 struct proc_inode {
 	struct pid *pid;
 	int fd;
@@ -69,7 +64,7 @@
 	struct proc_dir_entry *pde;
 	struct ctl_table_header *sysctl;
 	struct ctl_table *sysctl_entry;
-	struct proc_ns ns;
+	const struct proc_ns_operations *ns_ops;
 	struct inode vfs_inode;
 };