another typo

report/msb.tex

@@ -414,7 +414,7 @@ filter described by a simple CCDE in \figref{fig:smooth}. With a bounded input
 \faustexfig{LTI filter smoothing the input}{\label{fig:smooth}}
 {0.4}{../code/smooth-block.png}
 {0.5}{../code/smooth-sig-old.png}
-{\(y(t) = x(t) + \frac{1}{2} y(t-1)\)}{../code/plus.dsp}
+{\(y(t) = x(t) + \frac{1}{2} y(t-1)\)}{../code/smooth.dsp}
 
 which we can unroll for \(t\geq 0\) into