decode: release huffman_table from decode state
decode: release huffman_table from decode state

In i965_destroy_context, ensure we release the huffman_table
buffer_store from the decode state to avoid memory leak.

Fixes #190

Signed-off-by: U. Artie Eoff <32aece0d55055227b44d04b7d0051cf3d04ee871@intel.com>
(cherry picked from commit b86d86de86c4f071415e6519ae778859193c0b7e)

01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver