vorbis: return meaningful errors
h264_parser: K&R formatting cosmetics
tiff: refactor deflate support in a separate function

Report when zlib support is missing.
tiff: refactor fax support in a separate function
tiff: cleanup the error paths

Return the proper error values and optionally report them.
tiff: do not overread the source buffer

At least 2 bytes from the source are read every loop.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
faxcompr: K&R formatting cosmetics
faxcompr: return meaningful errors

And optionally forward them to the caller instead of concealing them.

Unify err and ret in a single variable.
Merge commit 'f8a4d5e970f32f8cc747f9fa7bd975ee4a060ea1'

* commit 'f8a4d5e970f32f8cc747f9fa7bd975ee4a060ea1':
  h264_parser: K&R formatting cosmetics
  vorbis: return meaningful errors

Conflicts:
	libavcodec/h264_parser.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '103937681d7e6afd3e8caf8937272575e450fb55'

* commit '103937681d7e6afd3e8caf8937272575e450fb55':
  tiff: refactor deflate support in a separate function

Conflicts:
	libavcodec/tiff.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '016c5b066de08a93a5f6b5beb0ef377356b35cde'

* commit '016c5b066de08a93a5f6b5beb0ef377356b35cde':
  tiff: refactor fax support in a separate function

Conflicts:
	libavcodec/tiff.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '999ccd2d0a43640921088578f138c874f6cc0f8a'

* commit '999ccd2d0a43640921088578f138c874f6cc0f8a':
  tiff: cleanup the error paths

Conflicts:
	libavcodec/tiff.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '9c2216976907336dfae0e8e38a4d70ca2465a92c'

* commit '9c2216976907336dfae0e8e38a4d70ca2465a92c':
  tiff: do not overread the source buffer

Conflicts:
	libavcodec/tiff.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'f32aefcf349f2f1367f0143782397643416d18f3'

* commit 'f32aefcf349f2f1367f0143782397643416d18f3':
  faxcompr: K&R formatting cosmetics

Conflicts:
	libavcodec/faxcompr.c

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

* qatar/master:
  faxcompr: return meaningful errors

Conflicts:
	libavcodec/faxcompr.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
doc/encoders: Add libvo-aacenc doc

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