Free walmethods before exiting

Magnus Hagander <magnus@hagander.net>

Commit: 78d109150bf133c38bcdc6d8c5bd9ff546ed1171
Author: Magnus Hagander <magnus@hagander.net>
Date: 2016-10-25T17:00:12Z
Releases: 10.0
Free walmethods before exiting

Not strictly necessary since we quite after, but could become important
in the future if we do restarts etc.

Michael Paquier with nitpicking from me

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