Occasionally I ruined the ability to do a in-place remap for
pre 3.16 kernels. Bring it back.

CID 1230182:  Logically dead code  (DEADCODE)
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>