forked from Mirrors/opensbi

In order to prevent a possible null pointer dereference, return early if either one of 'in' or 'data' is null. Signed-off-by: Jacob Garber <jgarber1@ualberta.ca> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>