drbd: drop code present under #ifdef which is relevant to 2.6.28 and below

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index c2cc28a..5c0c8be 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -1127,11 +1127,7 @@
 		const int sps = 1 << HT_SHIFT; /* sectors per slot */
 		const int mask = sps - 1;
 		const sector_t first_sectors = sps - (sect & mask);
-		bp = bio_split(bio,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
-				bio_split_pool,
-#endif
-				first_sectors);
+		bp = bio_split(bio, first_sectors);
 
 		/* we need to get a "reference count" (ap_bio_cnt)
 		 * to avoid races with the disconnect/reconnect/suspend code.