dm: block: Rename device number member dev to devnum

This is a device number, and we want to use 'dev' to mean a driver model
device. Rename the member.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
diff --git a/drivers/block/sandbox.c b/drivers/block/sandbox.c
index 093e133..14d3e38 100644
--- a/drivers/block/sandbox.c
+++ b/drivers/block/sandbox.c
@@ -26,7 +26,7 @@
 				     unsigned long start, lbaint_t blkcnt,
 				     void *buffer)
 {
-	int dev = block_dev->dev;
+	int dev = block_dev->devnum;
 	struct host_block_dev *host_dev = find_host_device(dev);
 
 	if (!host_dev)
@@ -48,7 +48,7 @@
 				      unsigned long start, lbaint_t blkcnt,
 				      const void *buffer)
 {
-	int dev = block_dev->dev;
+	int dev = block_dev->devnum;
 	struct host_block_dev *host_dev = find_host_device(dev);
 	if (os_lseek(host_dev->fd,
 		     start * host_dev->blk_dev.blksz,
@@ -96,7 +96,7 @@
 	blk_dev->lba = os_lseek(host_dev->fd, 0, OS_SEEK_END) / blk_dev->blksz;
 	blk_dev->block_read = host_block_read;
 	blk_dev->block_write = host_block_write;
-	blk_dev->dev = dev;
+	blk_dev->devnum = dev;
 	blk_dev->part_type = PART_TYPE_UNKNOWN;
 	part_init(blk_dev);