Simplify buffer size for write also.

Author: DnwK98

main/streams/plain_wrapper.c

@@ -356,7 +356,7 @@ static ssize_t php_stdiop_write(php_stream *stream, const char *buf, size_t coun
 #ifdef PHP_WIN32
 		ssize_t bytes_written = _write(data->fd, buf, (unsigned int)(count > INT_MAX ? INT_MAX : count));
 #else
-		ssize_t bytes_written = write(data->fd, buf, count);
+		ssize_t bytes_written = write(data->fd, buf, PLAIN_WRAP_BUF_SIZE(count));
 #endif
 		if (bytes_written < 0) {
 			if (PHP_IS_TRANSIENT_ERROR(errno)) {