dm table: fix various whitespace issues with recent DAX code

Also, rename device_synchronous to device_dax_synchronous.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm-table.c

@@ -891,7 +891,7 @@ int device_supports_dax(struct dm_target *ti, struct dm_dev *dev,
 }
 
 /* Check devices support synchronous DAX */
-static int device_synchronous(struct dm_target *ti, struct dm_dev *dev,
+static int device_dax_synchronous(struct dm_target *ti, struct dm_dev *dev,
 				  sector_t start, sector_t len, void *data)
 {
 	return dev->dax_dev && dax_synchronous(dev->dax_dev);
@@ -1921,7 +1921,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
 
 	if (dm_table_supports_dax(t, device_supports_dax, &page_size)) {
 		blk_queue_flag_set(QUEUE_FLAG_DAX, q);
-		if (dm_table_supports_dax(t, device_synchronous, NULL))
+		if (dm_table_supports_dax(t, device_dax_synchronous, NULL))
 			set_dax_synchronous(t->md->dax_dev);
 	}
 	else