libblkid/minix: Sanity check superblock s_state for v 1 and 2

libblkid/minix: Sanity check superblock s_state for v 1 and 2

Swap devices with specific values in the uuid can look like minix
devices to blkid. Add an extra check to make sure the state of the
filesystem has valid state flags.

A couple of offending swap uuids include:
35f1f264-137f-471a-bc85-acc9f4bc04a3
35f1f264-7f13-471a-bc85-acc9f4bc04a3
35f1f264-138f-471a-bc85-acc9f4bc04a3
35f1f264-8f13-471a-bc85-acc9f4bc04a3

Without this change a swap device with any of those uuids would be
detected as minix and swap by blkid.

Signed-off-by: Nate Clark <nate@neworld.us>