CLEANUP: cli: Remove useless debug message in cli_io_handler()

When compiled in debug mode, HAProxy prints a debug message at the end of
the cli I/O handle. It is pretty annoying and useless because, we can active
applet traces. Thus, just remove it.
diff --git a/src/cli.c b/src/cli.c
index 3bbc87d..43c36cc 100644
--- a/src/cli.c
+++ b/src/cli.c
@@ -1176,9 +1176,7 @@
 	}
 
  out:
-	DPRINTF(stderr, "%s@%d: st=%d, rqf=%x, rpf=%x, rqh=%lu, rqs=%lu, rh=%lu, rs=%lu\n",
-		__FUNCTION__, __LINE__,
-		sc->state, req->flags, res->flags, ci_data(req), co_data(req), ci_data(res), co_data(res));
+	return;
 }
 
 /* This is called when the stream connector is closed. For instance, upon an