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Enforces bands of even size even for custom modes

--- a/libcelt/modes.c

+++ b/libcelt/modes.c

@@ -171,7 +171,8 @@

    for (i=0;i<high;i++)

    {

       int target = bark_freq[lin+i];

-      eBands[i+low] = (target+(offset+res)/2)/res;

+      /* Round to an even value */

+      eBands[i+low] = (target+offset/2+res)/(2*res)*2;

       offset = eBands[i+low]*res - target;

    }

    /* Enforce the minimum spacing at the boundary */

@@ -178,7 +179,8 @@

    for (i=0;i<*nbEBands;i++)

       if (eBands[i] < i)

          eBands[i] = i;

-   eBands[*nbEBands] = (bark_freq[nBark]+res/2)/res;

+   /* Round to an even value */

+   eBands[*nbEBands] = (bark_freq[nBark]+res)/(2*res)*2;

    if (eBands[*nbEBands] > frame_size)

       eBands[*nbEBands] = frame_size;

    for (i=1;i<*nbEBands-1;i++)