Replace NULL with nullptr

Also fixed some lines that were too long, and a few other minor
details.

Change-Id: I6efba5fb6e03eb5d0a300fddb2a75bf8e2f175cb
diff --git a/runtime/zip_archive_test.cc b/runtime/zip_archive_test.cc
index 70a4dda..aded30c 100644
--- a/runtime/zip_archive_test.cc
+++ b/runtime/zip_archive_test.cc
@@ -42,11 +42,11 @@
   ScratchFile tmp;
   ASSERT_NE(-1, tmp.GetFd());
   std::unique_ptr<File> file(new File(tmp.GetFd(), tmp.GetFilename(), false));
-  ASSERT_TRUE(file.get() != NULL);
+  ASSERT_TRUE(file.get() != nullptr);
   bool success = zip_entry->ExtractToFile(*file, &error_msg);
   ASSERT_TRUE(success) << error_msg;
   ASSERT_TRUE(error_msg.empty());
-  file.reset(NULL);
+  file.reset(nullptr);
 
   uint32_t computed_crc = crc32(0L, Z_NULL, 0);
   int fd = open(tmp.GetFilename().c_str(), O_RDONLY);