make "size" variable in avpicture_alloc signed, since avpicture_get_size
returns -1 on error which was not detected with previous code. Originally committed as revision 5304 to svn://svn.ffmpeg.org/ffmpeg/trunk
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returns -1 on error which was not detected with previous code. Originally committed as revision 5304 to svn://svn.ffmpeg.org/ffmpeg/trunk