Removing variable from self in `module-roc-sink.c`

https://gitlab.freedesktop.org/pipewire/pipewire/-/blob/master/src/modules/module-roc-sink.c#L180

Quite strange that size is removed from self.
size always will be equal to 0 after that so why not use size = 0 directly?
Also looks that while loop is executed once at most

	for (i = 0; i < in->buffer->n_datas; i++) {
		d = &in->buffer->datas[i];
		size = d->chunk->size;
		offset = d->chunk->offset;

		while (size > 0) {
			memset(&frame, 0, sizeof(frame));

			frame.samples = SPA_MEMBER(d->data, offset, void);
			frame.samples_size = size;

			if (roc_sender_write(impl->sender, &frame) != 0) {
				pw_log_warn("Failed to write to roc sink");
				break;
			}

			offset += size;
			size -= size;    <------------- Size
		}
	}