[RFC PATCH 3/9] lib: fix messages.c build warn

[David Bremner]

On Sun,  8 Jan 2012 01:26:17 +0200, Jani Nikula <jani at nikula.org> wrote:
> lib/messages.c: In function ?notmuch_messages_move_to_next?:
> lib/messages.c:131:2: warning: ISO C forbids ?return? with expression, in 
> function returning void [-pedantic]

Pushed to master.

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