Bug 1615130 - Fix uninitialized data. r=padenot

Values are set to 0 by default rather than uninitialized. It is useful when JSContext is null.

Differential Revision: https://phabricator.services.mozilla.com/D79986

dom/media/webaudio/WebAudioUtils.cpp

@@ -113,7 +113,7 @@ void WebAudioUtils::LogToDeveloperConsole(uint64_t aWindowID,
   }
 
   nsAutoString spec;
-  uint32_t aLineNumber, aColumnNumber;
+  uint32_t aLineNumber = 0, aColumnNumber = 0;
   JSContext* cx = nsContentUtils::GetCurrentJSContext();
   if (cx) {
     nsJSUtils::GetCallingLocation(cx, spec, &aLineNumber, &aColumnNumber);