[#4874] Fixed compilation warning

sflphone-common/src/audio/delaydetection.cpp

@@ -330,7 +330,7 @@ int DelayDetection::getMaxIndex (float *data, int size)
 {
 
     float max = 0.0;
-    int k;
+    int k = 0;
 
     for (int i = 0; i < size; i++) {
         if (data[i] >= max) {