Fixing some of the issues found by clang static analyzer.

Bug: webrtc:8737
Change-Id: Ib436449c493336e7c35a72a96dc88cccdbb5bbaf
Reviewed-on: https://webrtc-review.googlesource.com/39200
Commit-Queue: Peter Hanspers <peterhanspers@webrtc.org>
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21607}
diff --git a/sdk/objc/Framework/Classes/PeerConnection/RTCAudioTrack.mm b/sdk/objc/Framework/Classes/PeerConnection/RTCAudioTrack.mm
index fffbd7c..e26088f 100644
--- a/sdk/objc/Framework/Classes/PeerConnection/RTCAudioTrack.mm
+++ b/sdk/objc/Framework/Classes/PeerConnection/RTCAudioTrack.mm
@@ -31,7 +31,7 @@
   std::string nativeId = [NSString stdStringForString:trackId];
   rtc::scoped_refptr<webrtc::AudioTrackInterface> track =
       factory.nativeFactory->CreateAudioTrack(nativeId, source.nativeAudioSource);
-  if ([self initWithNativeTrack:track type:RTCMediaStreamTrackTypeAudio]) {
+  if (self = [self initWithNativeTrack:track type:RTCMediaStreamTrackTypeAudio]) {
     _source = source;
   }
   return self;