Only allocate ptr_type when it's actually used. Change-Id: Iea5f93601a42f02a1866bdff099f63935fdd5b8d Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Found-by: Coverity Scan #1129117 Reviewed-on: https://review.coreboot.org/18017 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>