The update_extract tool works by finding the compressed size and
the compressed data in the updater. This is problematic since
without the uncompressed size, inflate can produce extra bytes
at end. This is not a problem for our tools but the device will
plain reject it if sent by MTP/sendfirm for example.
Workaround this issue by reading and rewriting the archive
after decompression so that only the meaningfull data is written.
Change-Id: I117f434b92a56d93d269af49c3e426cd8cc0c7e4
