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"len" is only used by some platforms' implementations (as controlled by various autoconf/#ifdef tokens) and only in a small codeblock in those cases, but was declared based on a looser #ifdef heuristic and in a larger scope. The result is an unused-variable warning when built on some platforms. Move declaration to the local codeblocks that use the variable, which also restricts it to the narrower set of platforms where those codeblocks are used. https://bugzilla.gnome.org/show_bug.cgi?id=689323
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