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vf_gradfun: fix uninitialized variable use

CC:libav-stable@libav.org
(cherry picked from commit 887d31d455915b6bde6814063384dafdee61164c)

Conflicts:

libavfilter/vf_gradfun.c

Anton Khirnov authored on 2013/02/28 16:47:21
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@@ -193,6 +193,7 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in)
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         direct = 1;
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         out = in;
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     } else {
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+        direct = 0;
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         out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
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         if (!out) {
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             avfilter_unref_bufferp(&in);