vsrc_movie: do not free avoption variables in uninit()

The generic code frees them as well. Since av_free was used to free them
instead of av_freep, this would result in a double free.
lavc: free the padded last frame during audio encoding properly
Merge commit 'eeeb5c291d3f78eaade5b99c2614c7cab0e9be79'

* commit 'eeeb5c291d3f78eaade5b99c2614c7cab0e9be79':
  vsrc_movie: do not free avoption variables in uninit()

Conflicts:
	libavfilter/src_movie.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  lavc: free the padded last frame during audio encoding properly

See: 7fff3df6b277d4f1ebc504e950c9de56cdc14ddd

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avdevice/x11grab: allocate just one Cursor

Fixes resource leak and Ticket2450

Reviewed-by: Carl Eugen Hoyos <cehoyos@ag.or.at>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
doc/decoders: Document libopencore-amrnb decoder

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