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Fixes the transient detector on silence

Previously silence would cause the divide approximation on 0/0 to return a
very large value, which would be interpreted as a transient

--- a/celt/celt_encoder.c

+++ b/celt/celt_encoder.c

@@ -343,9 +343,9 @@

       {

          int id;

 #ifdef FIXED_POINT

-         id = IMAX(0,IMIN(127,MULT16_32_Q15(tmp[i],norm))); /* Do not round to nearest */

+         id = MAX32(0,MIN32(127,MULT16_32_Q15(tmp[i]+EPSILON,norm))); /* Do not round to nearest */

 #else

-         id = IMAX(0,IMIN(127,(int)floor(64*norm*tmp[i]))); /* Do not round to nearest */

+         id = (int)MAX32(0,MIN32(127,floor(64*norm*(tmp[i]+EPSILON)))); /* Do not round to nearest */

 #endif

          unmask += inv_table[id];

       }