wmalossless: crash with forced codec

[ami_stuff]

​http://samples.mplayerhq.hu/flac/24-bit_192kHz.flac

I wanted to check with random files if deadlock is really fixed and found this:

(gdb) r -acodec wmalossless -i 24-bit_192kHz.flac -vn -f null - -loglevel 0
Starting program: D:\MinGW\msys\1.0\ffmpeg-HEAD-a67dcd7\ffmpeg_g.exe -acodec wma
lossless -i 24-bit_192kHz.flac -vn -f null - -loglevel 0
[New Thread 2652.0x4d8]
[New Thread 2652.0xf64]
[New Thread 2652.0xfd4]
[New Thread 2652.0xfb8]
[New Thread 2652.0x6b4]
[New Thread 2652.0x294]
[New Thread 2652.0x7b4]
[New Thread 2652.0x5d4]
[New Thread 2652.0xa80]
[New Thread 2652.0xa6c]

Program received signal SIGSEGV, Segmentation fault.
0x008369c4 in init_get_bits (bit_size=0, buffer=0x0, s=0x4ee808c)
    at libavcodec/get_bits.h:424
424         s->index              = 0;
(gdb) bt
#0  0x008369c4 in init_get_bits (bit_size=0, buffer=0x0, s=0x4ee808c)
    at libavcodec/get_bits.h:424
#1  decode_packet (avctx=0x4df6e60, data=0x4df7ec0, got_frame_ptr=0x22fa9c,
    avpkt=0x22f768) at libavcodec/wmalosslessdec.c:1189
#2  0x0059ffdd in avcodec_decode_audio4 (avctx=0x4df6e60, frame=0x4df7ec0,
    got_frame_ptr=0x22fa9c, avpkt=0x22f898) at libavcodec/utils.c:2124
#3  0x004141ea in decode_audio (got_output=<optimized out>,
    pkt=<optimized out>, ist=<optimized out>) at ffmpeg.c:1526
#4  output_packet (ist=0x55e3c60, pkt=0x0) at ffmpeg.c:1863
#5  0x004164bf in process_input (file_index=0) at ffmpeg.c:2928
#6  0x00b0b3f8 in transcode_step () at ffmpeg.c:3181
#7  transcode () at ffmpeg.c:3233
#8  main (argc=11, argv=<optimized out>) at ffmpeg.c:3411
(gdb)

also crashes with (autobuild)

ffmpeg version N-56663-g851a6e2 Copyright (c) 2000-2013 the FFmpeg developers
  built on Sep 26 2013 02:40:41 with gcc 4.5.0 (GCC) 20100414 (Fedora MinGW 4.5.
0-1.fc14)
  configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build --arch=
x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686-pc-min
gw32-gcc' --enable-pthreads --enable-memalign-hack --enable-runtime-cpudetect --
enable-cross-compile --enable-static --disable-shared --extra-libs='-lws2_32 -lw
inmm -lpthread' --extra-cflags='--static -I/var/www/users/research/ffmpeg/snapsh
ots/build/include' --extra-ldflags='-static -L/var/www/users/research/ffmpeg/sna
pshots/build/lib' --enable-bzlib --enable-zlib --enable-gpl --enable-version3 --
enable-nonfree --enable-libx264 --enable-libspeex --enable-libtheora --enable-li
bvorbis --enable-libfaac --enable-libxvid --enable-libopencore-amrnb --enable-li
bopencore-amrwb --enable-libmp3lame --enable-libfreetype --enable-libvpx --disab
le-decoder=libvpx
  libavutil      52. 46.100 / 52. 46.100
  libavcodec     55. 33.100 / 55. 33.100
  libavformat    55. 18.102 / 55. 18.102
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 87.100 /  3. 87.100
  libswscale      2.  5.100 /  2.  5.100
  libswresample   0. 17.103 /  0. 17.103
  libpostproc    52.  3.100 / 52.  3.100

[Michael Niedermayer]

Fixed in 286beebdc34d11a301dfa5189e84f1c399d56133