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/common/usb_storage.c b/common/usb_storage.c
index e105a95..60531e2 100644
--- a/common/usb_storage.c
+++ b/common/usb_storage.c
@@ -192,7 +192,7 @@
 			blkdev = &usb_dev_desc[usb_max_devs];
 			memset(blkdev, '\0', sizeof(struct blk_desc));
 			blkdev->if_type = IF_TYPE_USB;
-			blkdev->dev = usb_max_devs;
+			blkdev->devnum = usb_max_devs;
 			blkdev->part_type = PART_TYPE_UNKNOWN;
 			blkdev->target = 0xff;
 			blkdev->type = DEV_TYPE_UNKNOWN;
@@ -1029,7 +1029,7 @@
 static unsigned long usb_stor_read(struct blk_desc *block_dev, lbaint_t blknr,
 				   lbaint_t blkcnt, void *buffer)
 {
-	int device = block_dev->dev;
+	int device = block_dev->devnum;
 	lbaint_t start, blks;
 	uintptr_t buf_addr;
 	unsigned short smallblks;
@@ -1100,7 +1100,7 @@
 static unsigned long usb_stor_write(struct blk_desc *block_dev, lbaint_t blknr,
 				    lbaint_t blkcnt, const void *buffer)
 {
-	int device = block_dev->dev;
+	int device = block_dev->devnum;
 	lbaint_t start, blks;
 	uintptr_t buf_addr;
 	unsigned short smallblks;