demux-daemon: Set libmctp logging parameters

Just log to stderr, using --verbose to set the level.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
diff --git a/utils/mctp-demux-daemon.c b/utils/mctp-demux-daemon.c
index edde1bd..ca814f1 100644
--- a/utils/mctp-demux-daemon.c
+++ b/utils/mctp-demux-daemon.c
@@ -476,6 +476,8 @@
 		return EXIT_FAILURE;
 	}
 
+	mctp_set_log_stdio(ctx->verbose ? MCTP_LOG_DEBUG : MCTP_LOG_WARNING);
+
 	ctx->mctp = mctp_init();
 	assert(ctx->mctp);