Use va_list variable safely

src/ports/SkDebug_android.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkTypes.h"
 #include <stdio.h>
 
 static const size_t kBufferSize = 256;
 
 #define LOG_TAG "skia"
 #include <android/log.h>
 
 static bool gSkDebugToStdOut = false;
 
 extern "C" void AndroidSkDebugToStdOut(bool debugToStdOut) {
     gSkDebugToStdOut = debugToStdOut;
 }
 
 void SkDebugf(const char format[], ...) {
-    va_list args;
-    va_start(args, format);
-    __android_log_vprint(ANDROID_LOG_DEBUG, LOG_TAG, format, args);
+    va_list args1, args2;
+    va_start(args1, format);
+    va_copy(args2, args1);
+    __android_log_vprint(ANDROID_LOG_DEBUG, LOG_TAG, format, args1);
 
     // Print debug output to stdout as well.  This is useful for command
     // line applications (e.g. skia_launcher)
     if (gSkDebugToStdOut) {
-        vprintf(format, args);
+        vprintf(format, args2);
     }
 
-    va_end(args);
+    va_end(args1);
+    va_end(args2);
 }