Black Screen: Fix dlfree error when delet mZipInflater.

_CompressedAsset::close() and _CompressedAsset::getBuffer() may
delete mZipInflater object without mutex protection. This may cause
race condition during two thread try to delete mZipInflater object
at the same time. Fix this issue by adding auto local mutex lock in
_CompressedAsset::close() and _CompressedAsset::getBuffer().

CRs-Fixed: 822097

Change-Id: I7c8d2e308e196db54c6a91bc2d16545b331f87bc