control/zone: Fix missing cassert include

This was relying on sdbusplus to provide a transitive include for
<cassert>. Since we are directly using the assert() call we should
include <cassert> ourselves.

Change-Id: I095af26c7a589ab337facc6ac2d0c4983a0f0c2c
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed