debian/postrm: remove /lib/firmware/ if it's empty
authorAntonio Ospite <ao2@ao2.it>
Sat, 9 Jan 2016 14:36:28 +0000 (15:36 +0100)
committerAntonio Ospite <ao2@ao2.it>
Sat, 9 Jan 2016 14:36:28 +0000 (15:36 +0100)
This fixes a warning in piuparts: there are cases when this package is
the only installed one to use /lib/firmware.


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