Patch default fifo_batch to 1 for better SSD responsiveness

diff -Nru a/drivers/block/deadline-iosched.c b/drivers/block/deadline-iosched.c
--- a/block/deadline-iosched.c  Sun Mar  29 12:55:01 2009
+++ b/block/deadline-iosched.c  Sun Mar  29 12:55:01 2009
@@ -25,7 +25,7 @@
  * front fifo request expires.
  */
-static int fifo_batch = 16;
+static int fifo_batch = 1;