poppy: Check NULL menu_array params in vb2_get_current_menu_size()
poppy: Check NULL menu_array params in vb2_get_current_menu_size()

BUG=chrome-os-partner:61275
BRANCH=None
TEST=None

Change-Id: I1d88e552a4c9184061207a8e14e32dfb1a39745a
Signed-off-by: Shelley Chen <ab7b8cc85923339aed379eb1c5cc4dccfd2eb3d7@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/434248
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot