Bug 1140478: Free the string returned by PrintJSStack(), in android shutdown logging function. r=jorendorff

dom/power/PowerManagerService.cpp

@@ -9,6 +9,7 @@
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/Services.h"
+#include "jsprf.h"
 #include "nsIDOMWakeLockListener.h"
 #include "nsIDOMWindow.h"
 #include "nsIObserverService.h"
@@ -31,6 +32,7 @@ static void LogFunctionAndJSStack(const char* funcname) {
                       "Call to %s. The JS stack is:\n%s\n",
                       funcname,
                       jsstack ? jsstack : "<no JS stack>");
+  JS_smprintf_free(jsstack);
 }
 // bug 839452
 #define LOG_FUNCTION_AND_JS_STACK() \