Use the file opened from argv[1] in preparser-process.cc

preparser/preparser-process.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 175 matching lines @@
   return 0;
 }
 
 } }  // namespace v8::internal
 
 
 int main(int argc, char* argv[]) {
   FILE* input = stdin;
   if (argc > 1) {
     char* arg = argv[1];
-    FILE* file = fopen(arg, "rb");
-    if (!file) return EXIT_FAILURE;
+    input = fopen(arg, "rb");
+    if (input == NULL) return EXIT_FAILURE;
   }
   int status = 0;
   do {
     status = v8::internal::PreParseIO(input);
   } while (status == 0);
   fprintf(stderr, "EXIT: Failure %d\n", status);
   fflush(stderr);
   return EXIT_FAILURE;
 }