libavcodec/libx264: Use av_freep() avoid leaving stale pointers in memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
libavcodec/libxavs: Use av_freep() avoid leaving stale pointers in memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
libavcodec/tiffenc: Use av_freep() avoid leaving stale pointers in memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/float_dsp: add avpriv_float_dsp_alloc()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
doc/APIchanges: Fix some wrong versions

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