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Prepare for re-enabling -Wunused-but-set-variable. The variable 'c' appears unused, but I'm not sure what should be done with it. Annotate it with __maybe_unused. Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Reviewed-by: Jouni Högander <jouni.hogander@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/9ee9e7d7a0a7ad4ff03c14e64b95d3fbcb7885a4.1685119007.git.jani.nikula@intel.com