nlplug-findfs segfaults on bogus extraneous cryptsetup execution

When opening a cryptsetup device with nlplug-findfs, the device is first unlocked correctly, and then cryptsetup is called a second time, and continues asking for the passphrase until the amount of tries is exhausted. Then the application segfaults, while the cryptsetup device is open correctly (from the first execution).

(from redmine: issue id 6217, created on 2016-09-26, closed on 2017-04-07)

Changesets:
- Revision 386aab2a by Timo Teräs on 2016-11-24T12:07:52Z:

main/mkinitfs: upgrade to 3.0.6

fixes #6217
fixes #6469
fixes #6473

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