libbinder_rs : removing assert while reading parcel

Asserting while trying to read the parcel received from another process
is causing crashes in fuzzer. Since, there is no gurantee that received
parcel may have exact data which is being read, this assert should not
exist.

Test: m libbinder_rs
Bug: 261827787
Change-Id: I8a96ef05e65ff8250644accd7d237a486ec16cff