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Fixes a surround bug on loud signal

The constant was copied from the analysis code which uses +/-1 as float
scaling, but surround_analysis() uses +/-32767.

--- a/src/opus_multistream_encoder.c

+++ b/src/opus_multistream_encoder.c

@@ -304,7 +304,7 @@

          sum = celt_inner_prod(in, in, frame_size+overlap, 0);

          /* This should filter out both NaNs and ridiculous signals that could

             cause NaNs further down. */

-         if (!(sum < 1e9f) || celt_isnan(sum))

+         if (!(sum < 1e18f) || celt_isnan(sum))

          {

             OPUS_CLEAR(in, frame_size+overlap);

             preemph_mem[c] = 0;