Fixes valgrind uninitialized memory errors when decoding png.

CC:libav-stable@libav.org

Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Paul B Mahol <onemda@gmail.com>

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

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

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
(cherry picked from commit f2e246f5)

Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>

Originally committed as revision 16684 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 12228 to svn://svn.ffmpeg.org/ffmpeg/trunk

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Originally committed as revision 6779 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 6689 to svn://svn.ffmpeg.org/ffmpeg/trunk

and fix GPL/LGPL version mismatches.

Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 6356 to svn://svn.ffmpeg.org/ffmpeg/trunk

outside their declaring source file and which have no corresponding prototype.
patch by Stefan Huehner stefan^^@^^huehner^^.^^org

Originally committed as revision 5497 to svn://svn.ffmpeg.org/ffmpeg/trunk

taken from a patch by Steve L'Homme

Originally committed as revision 5127 to svn://svn.ffmpeg.org/ffmpeg/trunk

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Originally committed as revision 3872 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3822 to svn://svn.ffmpeg.org/ffmpeg/trunk

When bswap_32 is a macro, png images fail to decode properly, patch by (Milan Cutka <cutka>at<szm>dot<sk>)

Originally committed as revision 3672 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3665 to svn://svn.ffmpeg.org/ffmpeg/trunk

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Originally committed as revision 1529 to svn://svn.ffmpeg.org/ffmpeg/trunk