[PATCH] use simpler test_task_thread to test current ti flags

["Serge E. Hallyn" <serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

This ought to be folded into the 
	'fix 31-bit s390 checkpoint/restart wrappers'
patch which I sent earlier today.  Not a bug without it, just
not as nice.

Signed-off-by: Serge E. Hallyn <serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
---
 arch/s390/kernel/checkpoint.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/s390/kernel/checkpoint.c b/arch/s390/kernel/checkpoint.c
index 8ec12c6..60ba04d 100644
--- a/arch/s390/kernel/checkpoint.c
+++ b/arch/s390/kernel/checkpoint.c
@@ -148,7 +148,8 @@ int checkpoint_mm_context(struct ckpt_ctx *ctx, struct mm_struct *mm)
 
 int restore_thread(struct ckpt_ctx *ctx)
 {
-	if (test_tsk_thread_flag(current, TIF_31BIT)) {
+	/* a 31-bit task cannot call sys_restart right now */
+	if (test_thread_flag(TIF_31BIT)) {
 		ckpt_err(ctx, -EINVAL, "restart from 31-bit task\n");
 		return -EINVAL;
 	}
-- 
1.6.1