vzctl chkpnt: fix ignoring DUMPDIR

We were using dumpdir from g_p, but since commit 1f6a74a
this was changed to cmd_p, so we need to propagate the parameter.

Assignment is non-conditional since dumpdir can't come from cmdline.

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
1 file changed