avcodec/bitstream: print vlc length in error case.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/huffman: use named identifer for the bits constant

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/huffman: increase bits constant

Fixes Ticket2593

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>