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fix rounding

--- a/src/dcshift.c

+++ b/src/dcshift.c

@@ -124,17 +124,9 @@

                 *obuf++ = sample;

             }

     }

-    else

-    {

-        /* quite basic, with clipping */

-        for (;len>0; len--)

-        {

-                double f;

-

-                f = dcshift * SOX_SAMPLE_MAX + *ibuf++;

-                SOX_SAMPLE_CLIP_COUNT(f, dcs->clipped);

-                *obuf++ = f;

-        }

+    else for (; len > 0; --len) {            /* quite basic, with clipping */

+      double d = dcshift * (SOX_SAMPLE_MAX + 1.) + *ibuf++;

+      *obuf++ = SOX_ROUND_CLIP_COUNT(d, effp->clips);

     }

     return SOX_SUCCESS;

 }