We may have expanded_len == 0 when calling inflate(). After switching to
using std::vector, it passes a nullptr buffer to inflate() and leads to
Z_STREAM_ERROR.
Bug: 29312140
Change-Id: Iab7c6c07a9e8488e844e7cdda76d02bd60d2ea98
update_engine need it for the new IMGDIFF operation.
Also removed __unused in ApplyImagePatch() as I got error building it
for the host, and I think it's dangerous not checking the size of the
input.
Test: mma
Bug: 26628339
Change-Id: I22d4cd55c2c3f87697d6afdf10e8106fef7d1a9c
