mtd: block2mtd: remove redundant initialization of 'bdev'

Pointer bdev is being initialized however this value is never
read as bdev is assigned an updated value from the returned
call to blkdev_get_by_path.  Remove the redundant assignment.

Cleans up clang warning:
drivers/mtd/devices/block2mtd.c:228:23: warning: Value stored to
'bdev' during its initialization is never read
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@bootlin.com>

drivers/mtd/devices/block2mtd.c

@@ -225,7 +225,7 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size,
 	int i;
 #endif
 	const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
-	struct block_device *bdev = ERR_PTR(-ENODEV);
+	struct block_device *bdev;
 	struct block2mtd_dev *dev;
 	char *name;