Prefer char over gchar

Guido Güntherrequested to merge
guidog/phosh:gchar-searchd into main

The recently added searchd code added plenty new occurrences. Let's clean everything up that's not imported from elsewhere so we can run @gautham_x style check once it landed for that too.

Signed-off-by: Guido Günther agx@sigxcpu.org

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