Add missing if-clause for residual_echo_likelihood_recent_max

This is a follow-up to https://codereview.webrtc.org/2629563003/.

BUG=webrtc:6797
TBR=solenberg@webrtc.org

Review-Url: https://codereview.webrtc.org/2632243002
Cr-Commit-Position: refs/heads/master@{#16103}
diff --git a/webrtc/api/statscollector.cc b/webrtc/api/statscollector.cc
index dd5673e..7761d10 100644
--- a/webrtc/api/statscollector.cc
+++ b/webrtc/api/statscollector.cc
@@ -128,6 +128,8 @@
   if (residual_echo_likelihood >= 0.0f) {
     report->AddFloat(StatsReport::kStatsValueNameResidualEchoLikelihood,
                      residual_echo_likelihood);
+  }
+  if (residual_echo_likelihood_recent_max >= 0.0f) {
     report->AddFloat(
         StatsReport::kStatsValueNameResidualEchoLikelihoodRecentMax,
         residual_echo_likelihood_recent_max);