Remove unused member from nsproxy

The nslock spinlock is not used in the kernel at all.  Remove it.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/init_task.h

@@ -76,7 +76,6 @@ extern struct nsproxy init_nsproxy;
 #define INIT_NSPROXY(nsproxy) {						\
 	.pid_ns		= &init_pid_ns,					\
 	.count		= ATOMIC_INIT(1),				\
-	.nslock		= __SPIN_LOCK_UNLOCKED(nsproxy.nslock),		\
 	.uts_ns		= &init_uts_ns,					\
 	.mnt_ns		= NULL,						\
 	INIT_NET_NS(net_ns)                                             \

include/linux/nsproxy.h

@@ -23,7 +23,6 @@ struct pid_namespace;
  */
 struct nsproxy {
 	atomic_t count;
-	spinlock_t nslock;
 	struct uts_namespace *uts_ns;
 	struct ipc_namespace *ipc_ns;
 	struct mnt_namespace *mnt_ns;