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Fix DRED failure

We weren't reserving enough bytes for the DRED extension

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -2209,7 +2209,8 @@

        int dred_chunks;

        int dred_bytes_left;

        dred_chunks = IMIN((st->dred_duration+5)/4, DRED_NUM_REDUNDANCY_FRAMES/2);

-       dred_bytes_left = IMIN(DRED_MAX_DATA_SIZE, max_data_bytes-ret-2);

+       /* Remaining space for DRED, accounting for cost the 3 extra bytes for code 3, padding length, and extension number. */

+       dred_bytes_left = IMIN(DRED_MAX_DATA_SIZE, max_data_bytes-ret-3);

        /* Check whether we actually have something to encode. */

        if (dred_chunks >= 1 && dred_bytes_left >= DRED_MIN_BYTES+2) {

            int dred_bytes;

-- 

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