futex: Revert "futex: Mark get_robust_list as deprecated"

This reverts commit ec0c4274.

get_robust_list() is in use and a removal would break existing user
space. With the permission checks in place it's not longer a security
hole. Remove the deprecation warnings.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: akpm@linux-foundation.org
Cc: paul.gortmaker@windriver.com
Cc: davej@redhat.com
Cc: keescook@chromium.org
Cc: stable@vger.kernel.org
Cc: ebiederm@xmission.com

kernel/futex.c

@@ -2471,8 +2471,6 @@ SYSCALL_DEFINE3(get_robust_list, int, pid,
 	if (!futex_cmpxchg_enabled)
 		return -ENOSYS;
 
-	WARN_ONCE(1, "deprecated: get_robust_list will be deleted in 2013.\n");
-
 	rcu_read_lock();
 
 	ret = -ESRCH;

kernel/futex_compat.c

@@ -142,8 +142,6 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 	if (!futex_cmpxchg_enabled)
 		return -ENOSYS;
 
-	WARN_ONCE(1, "deprecated: get_robust_list will be deleted in 2013.\n");
-
 	rcu_read_lock();
 
 	ret = -ESRCH;