Bug#453727: bashism in postinst script

[Victor Seva]

Just a simple patch in order to solve this bug.
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|   ,''`.                                             Victor Seva |
|  : :' :                      linuxmaniac at torreviejawireless.org |
|  `. `'                                   PGP Key ID: 0xDD12F253 |
|    `-                        Debian user, admin and contributor |
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