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optimisation: one less conditional branch in pulse2comb()

--- a/libcelt/cwrs.c

+++ b/libcelt/cwrs.c

@@ -294,10 +294,11 @@

       int s;

       n=abs(_y[j]);

       s=_y[j]<0;

-      for(;n-->0;k++){

+      do {

         _x[k]=j;

         _s[k]=s;

-      }

+        k++;

+      } while (--n>0);

     }

   }

 }