btrfs/162: Stop using device mount option

btrfs is clever enough to figure out which devices constitute the
sprout fs even without specifying them explicitly with -o device.
Additionally, explicitly settings the devices via -o device reduces
coverage of the test since it didn't detect breakage a local change
introduced. Without -o device instead this breakage was detected.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
1 file changed