vf_format: do not use the AVFilterFormats internals.

Use the formats.h API instead.
lavfi: factorize freeing a link
avfilter.c: cosmetics, reformat
avfilter: check a malloc in avfilter_link().

Additionally change sizeof(type) into sizeof(var)
prores: decode alpha plane when it's present
Escape 130 (RPL) decoder

Some fixes provided by Paul B Mahol <onemda@gmail.com>
and Michael Niedermayer <michaelni@gmx.at> and me.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
Merge commit '1dd35611433c224e2231ed7ae26b5b560863a3cb'

* commit '1dd35611433c224e2231ed7ae26b5b560863a3cb':
  vf_format: do not use the AVFilterFormats internals.

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'd79bd6040599ef017dc45d5997fcc959ab1f71f6'

* commit 'd79bd6040599ef017dc45d5997fcc959ab1f71f6':
  lavfi: factorize freeing a link

Conflicts:
	libavfilter/avfilter.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'bf5b5d2b1561535cc013c12ab8033228bb0d0081'

* commit 'bf5b5d2b1561535cc013c12ab8033228bb0d0081':
  avfilter.c: cosmetics, reformat

Conflicts:
	libavfilter/avfilter.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'cebdedca57d95834a8f8098c7b6a322a1163e26b'

* commit 'cebdedca57d95834a8f8098c7b6a322a1163e26b':
  prores: decode alpha plane when it's present
  avfilter: check a malloc in avfilter_link().

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

* qatar/master:
  Escape 130 (RPL) decoder

Conflicts:
	libavcodec/Makefile
	libavcodec/allcodecs.c
	libavcodec/codec_desc.c
	libavcodec/escape130.c
	libavcodec/version.h

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