[Commotion-admin] [olsrd] Fix Issue 11 (#12)

[hawkinswnaf]

Use NULL rather than "" to signal that we are
not passing any pins to the keyring_enter_pin
function.
You can merge this Pull Request by running:

  git pull https://github.com/opentechinstitute/olsrd no-11-fix

Or you can view, comment on it, or merge it online at:

  https://github.com/opentechinstitute/olsrd/pull/12

-- Commit Summary --

  * Fix Issue 11

-- File Changes --

    M lib/mdp/src/olsrd_mdp.c (2)

-- Patch Links --

https://github.com/opentechinstitute/olsrd/pull/12.patch
https://github.com/opentechinstitute/olsrd/pull/12.diff
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