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}

examples/objc/AppRTCMobile/ARDCaptureController.m

@@ -21,7 +21,7 @@
 
 - (instancetype)initWithCapturer:(RTCCameraVideoCapturer *)capturer
                         settings:(ARDSettingsModel *)settings {
-  if ([super init]) {
+  if (self = [super init]) {
     _capturer = capturer;
     _settings = settings;
     _usingFrontCamera = YES;