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Slightly increase the safety margin for opus_pcm_soft_clip()

No values outside of +/-1 detected now.

--- a/src/opus.c

+++ b/src/opus.c

@@ -104,10 +104,10 @@

          /* Compute a such that maxval + a*maxval^2 = 1 */

          a=(maxval-1)/(maxval*maxval);

-         /* Slightly boost "a" by 2^-24. This is just enough to ensure -ffast-math

+         /* Slightly boost "a" by 2^-22. This is just enough to ensure -ffast-math

             does not cause output values larger than +/-1, but small enough not

             to matter even for 24-bit output.  */

-         a += a*6e-8;

+         a += a*2.4e-7;

          if (x[i*C]>0)

             a = -a;

          /* Apply soft clipping */