Fix in SpMV benchmark results.

      cusparseCopy = cusparseResult;

      a = cudaCopy - hostResult;

      b = cudaCopy - cusparseCopy;

      return RowElements( { 

         convertToString( time ),

         convertToString( stddev ),

         convertToString( stddev/time ),

         speedup != 0 ? convertToString( speedup ) : "N/A",

         convertToString( max( abs( a ) ) ),

         convertToString( lpNorm( a, 2.0 ) ),

         convertToString( max( abs( b ) ) ),

         convertToString( lpNorm( b, 2.0 ) ) } );

      RowElements elements;

      elements << time << stddev << stddev/time;

      if( speedup != 0.0 )

         elements << speedup;

      else elements << "N/A";

      elements << max( abs( a ) ) << lpNorm( a, 2.0 ) << max( abs( b ) ) << lpNorm( b, 2.0 );

      return elements;

   }

   HostVector &hostResult;