minidump: Be consistent about setting the fields of WritableIoVec

minidump/minidump_file_writer.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 132 matching lines @@
 bool MinidumpFileWriter::WriteObject(FileWriterInterface* file_writer) {
   DCHECK_EQ(state(), kStateWritable);
   DCHECK_EQ(streams_.size(), stream_types_.size());
 
   WritableIoVec iov;
   iov.iov_base = &header_;
   iov.iov_len = sizeof(header_);
   std::vector<WritableIoVec> iovecs(1, iov);
 
   for (internal::MinidumpStreamWriter* stream : streams_) {
+    iov.iov_base = stream->DirectoryListEntry();
     iov.iov_len = sizeof(MINIDUMP_DIRECTORY);
-    iov.iov_base = stream->DirectoryListEntry();
     iovecs.push_back(iov);
   }
 
   return file_writer->WriteIoVec(&iovecs);
 }
 
 }  // namespace crashpad