x86: ptrace, bts: fix an unreachable statement

x86: ptrace, bts: fix an unreachable statement

upstream commit: 5a8ac9d28dae5330c70562c7d7785f5104059c17

Commit c2724775ce57c98b8af9694857b941dc61056516 put a statement
after return, which makes that statement unreachable.

Move that statement before return.

Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Markus Metzger <markus.t.metzger@intel.com>
LKML-Reference: <20090313075622.GB8933@hack>
Cc: <stable@kernel.org> # .29 only
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>