[minijail] don't forget to enter pid namespace

minijail_preexec() clears the pid namespace flag. Oops.

BUG=chromium-os:31862
TEST=adhoc,security_Minijail0
minijail0 -p /bin/ps should show ps as pid 2

Change-Id: I269805d0efb1d7c768420d3708ae1e93c6fa6a31
Signed-off-by: Elly Jones <ellyjones@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/25300
Reviewed-by: Jim Hebert <jimhebert@chromium.org>
1 file changed