Fix /analyze warning and update code URL.

base/trace_event/trace_event_etw_export_win.cc

Index: base/trace_event/trace_event_etw_export_win.cc
diff --git a/base/trace_event/trace_event_etw_export_win.cc b/base/trace_event/trace_event_etw_export_win.cc
index f7f9eccaa4564194a0d40325d8895d80e0858e8a..4eed7fe4daa8b245f87c5d80e212e889db6dd592 100644
--- a/base/trace_event/trace_event_etw_export_win.cc
+++ b/base/trace_event/trace_event_etw_export_win.cc
@@ -12,7 +12,7 @@
 #include "base/trace_event/trace_event_impl.h"
 
 // The GetProcAddress technique is borrowed from
-// https://github.com/randomascii/main/tree/master/xperf/ETWProviders
+// https://github.com/google/UIforETW/tree/master/ETWProviders
 //
 // EVNTAPI is used in evntprov.h which is included by chrome_events_win.h.
 // We define EVNTAPI without the DECLSPEC_IMPORT specifier so that we can
@@ -51,6 +51,7 @@ ULONG EVNTAPI EventRegister(LPCGUID ProviderId,
   if (EventRegisterProc)
     return EventRegisterProc(ProviderId, EnableCallback, CallbackContext,
                              RegHandle);
+  *RegHandle = 0;

[dsinclair, 2015/05/19 15:39:37]

Does chromium still use 0 or is nullptr acceptable now?

   return 0;
 }