Fix libutils_binder_sdk build warnings

-Wclass-memaccess
-Winvalid-offsetof
-Wsequence-point
-Wzero-as-null-pointer-constant (turned on in ag/4503295)

Bug: 285204695
Test: m libutils_binder_sdk
Change-Id: I5b988f498cb8e0cf04617a4f7fd41ba9970d321d
5 files changed