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Making use of previously unused range of the laplace encoder to have a slightly
wider range of values.

--- a/libcelt/laplace.c

+++ b/libcelt/laplace.c

@@ -63,13 +63,18 @@

       fs = (fs*(ec_int32)decay)>>14;

       if (fs == 0)

       {

-         fs = tmp_s;

-         fl = tmp_l;

-         if (s)

-            *value = -i;

-         else

-            *value = i;

-         break;

+         if (fl+2 <= ft)

+         {

+            fs = 1;

+         } else {

+            fs = tmp_s;

+            fl = tmp_l;

+            if (s)

+               *value = -i;

+            else

+               *value = i;

+            break;

+         }

       }

    }

    if (fl < 0)

@@ -103,6 +108,10 @@

    {

       fl = fh;

       fs = (fs*(ec_int32)decay)>>14;

+      if (fs == 0 && fh+2 <= ft)

+      {

+         fs = 1;

+      }

       fh += fs*2;

       val++;

    }