This eliminate

 | ipc_ns.c:287:2: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]

and makes code simplier.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>