Set BFI palette opaque.

libavcodec/bfi.c

@@ -80,7 +80,7 @@ static int bfi_decode_frame(AVCodecContext * avctx, void *data,
         pal = (uint32_t *) bfi->frame.data[1];
         for (i = 0; i < avctx->extradata_size / 3; i++) {
             int shift = 16;
-            *pal = 0;
+            *pal = 0xFF << 24;
             for (j = 0; j < 3; j++, shift -= 8)
                 *pal +=
                     ((avctx->extradata[i * 3 + j] << 2) |