Update test/http_tests.cc

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: whwjiang

test/http_tests.cc

@@ -111,7 +111,8 @@ TEST(TestHTTPFile, TestWriteSmallFile) {
 
 	XrdOucEnv env;
 	std::unique_ptr<XrdOssDF> fh(fs.newFile());
-	// Create a small file
+	auto rc =
+		fh->Open("/test_write.txt", O_WRONLY | O_CREAT | O_TRUNC, 0644, env);
 	auto rc = fh->Open("/test_write.txt", O_WRONLY | O_CREAT | O_TRUNC, 0644, env);
 	ASSERT_EQ(rc, 0);