nuplayer: handle error from MediaCodec in Decoder handleAnOutputBuffer

MediaCodec could send out message of output buffer available right before
it hits an error and clears its buffers.
Test: compiles
Author:    Shalaj Jain <shalajj@codeaurora.org>

Change-Id: Ife308f3b8dc0448bcd1112b13cc0805bf7dedd7d
(cherry picked from commit 55f70d17df468db2b6691cbd7285a461e812eee4)