[S390] use LIST_HEAD instead of LIST_HEAD_INIT

single list_head variable initialized with LIST_HEAD_INIT could almost
always can be replaced with LIST_HEAD declaration, this shrinks the code
and looks better.

Signed-off-by: Denis Cheng <crquan@gmail.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 15a5789..7779bfc 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -82,7 +82,7 @@
 	struct request_queue *dcssblk_queue;
 };
 
-static struct list_head dcssblk_devices = LIST_HEAD_INIT(dcssblk_devices);
+static LIST_HEAD(dcssblk_devices);
 static struct rw_semaphore dcssblk_devices_sem;
 
 /*