drbd: Avoid comma separated statements

Use semicolons and braces.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/drbd/drbd_receiver.c

@@ -111,8 +111,10 @@ static struct page *page_chain_tail(struct page *page, int *len)
 {
 	struct page *tmp;
 	int i = 1;
-	while ((tmp = page_chain_next(page)))
-		++i, page = tmp;
+	while ((tmp = page_chain_next(page))) {
+		++i;
+		page = tmp;
+	}
 	if (len)
 		*len = i;
 	return page;