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

@@ -118,7 +118,6 @@ TEST(TestHTTPFile, TestWriteSmallFile) {
 
 	// Write some test data
 	const char test_data[] = "This is a test file for writing operations.";
-	const size_t data_size = strlen(test_data);
 
 	auto write_res = fh->Write(test_data, 0, data_size);
 	ASSERT_EQ(write_res, static_cast<ssize_t>(data_size));