xen/blkback: fix white space code style issues

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

drivers/block/xen-blkback/blkback.c

@@ -891,7 +891,7 @@ static int xen_blkbk_map(struct xen_blkif_ring *ring,
 out:
 	for (i = last_map; i < num; i++) {
 		/* Don't zap current batch's valid persistent grants. */
-		if(i >= map_until)
+		if (i >= map_until)
 			pages[i]->persistent_gnt = NULL;
 		pages[i]->handle = BLKBACK_INVALID_HANDLE;
 	}

drivers/block/xen-blkback/common.h

@@ -296,7 +296,7 @@ struct xen_blkif_ring {
 	struct work_struct	free_work;
 	/* Thread shutdown wait queue. */
 	wait_queue_head_t	shutdown_wq;
-	struct xen_blkif 	*blkif;
+	struct xen_blkif	*blkif;
 };
 
 struct xen_blkif {
@@ -315,7 +315,7 @@ struct xen_blkif {
 	atomic_t		drain;
 
 	struct work_struct	free_work;
-	unsigned int 		nr_ring_pages;
+	unsigned int		nr_ring_pages;
 	bool			multi_ref;
 	/* All rings for this device. */
 	struct xen_blkif_ring	*rings;
@@ -329,7 +329,7 @@ struct seg_buf {
 };
 
 struct grant_page {
-	struct page 		*page;
+	struct page		*page;
 	struct persistent_gnt	*persistent_gnt;
 	grant_handle_t		handle;
 	grant_ref_t		gref;