Fixes CID 1322359, CID 1322358.

Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com>
---
 libavcodec/pngdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index d180141..fe22225 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -1006,7 +1006,7 @@ static int handle_p_frame_apng(AVCodecContext *avctx, 
PNGDecContext *s,
             uint8_t *background = buffer + s->image_linesize * y + s->bpp * 
s->x_offset;
             for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground 
+= s->bpp, background += s->bpp) {
                 size_t b;
-                uint8_t foreground_alpha, background_alpha, output_alpha;
+                uint8_t foreground_alpha = 0, background_alpha, output_alpha;
                 uint8_t output[4];
 
                 // Since we might be blending alpha onto alpha, we use the 
following equations:
-- 
2.6.0

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