[SCSI] iscsi update: setup pool before using

>From andmike@us.ibm.com:

 Ensure that pool data is setup prior to calling mempool_create as it will
 call the the alloc function during create.
Signed-off-by: NMike Anderson <andmike@us.ibm.com>
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NAlex Aizman <itn780@yahoo.com>
Signed-off-by: NDmitry Yusupov <dmitry_yus@yahoo.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_transport_iscsi.c

@@ -530,6 +530,12 @@ mempool_zone_init(unsigned max, unsigned size, unsigned hiwat)
 	if (!zp)
 		return NULL;
 
+	zp->size = size;
+	zp->hiwat = hiwat;
+	INIT_LIST_HEAD(&zp->freequeue);
+	spin_lock_init(&zp->freelock);
+	atomic_set(&zp->allocated, 0);
+
 	zp->pool = mempool_create(max, mempool_zone_alloc_skb,
 				  mempool_zone_free_skb, zp);
 	if (!zp->pool) {
@@ -537,13 +543,6 @@ mempool_zone_init(unsigned max, unsigned size, unsigned hiwat)
 		return NULL;
 	}
 
-	zp->size = size;
-	zp->hiwat = hiwat;
-
-	INIT_LIST_HEAD(&zp->freequeue);
-	spin_lock_init(&zp->freelock);
-	atomic_set(&zp->allocated, 0);
-
 	return zp;
 }