Don't error out if result is non-zero in revised decompress
Don't error out if result is non-zero in revised decompress

Since the new decompress function is intended to be passed
chunks of compress data we expect the lz4 library to return
non-zero exit values until a frame is fully decompressed.

We'll instead store the return value in the context as a
status code that can be checked.

python-lz4/python-lz4,python-lz4/python-lz4