Check for null data buffer in AParcel_marshal

Test: m binder_parcel_fuzzer &&
out/host/linux-x86/fuzz/x86_64/binder_parcel_fuzzer/binder_parcel_fuzzer
Bug: 265412053

Change-Id: I2f2b9b82ef1f86ba046deffba6d719c1be433ab5
1 file changed