of/fdt: don't ignore errors from of_setup_earlycon

If of_setup_earlycon we should keep on iterating earlycon options
instead of breaking out of the loop.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Rob Herring <robh@kernel.org>

drivers/of/fdt.c

@@ -947,8 +947,8 @@ int __init early_init_dt_scan_chosen_stdout(void)
 		if (fdt_node_check_compatible(fdt, offset, match->compatible))
 			continue;
 
-		of_setup_earlycon(match, offset, options);
-		return 0;
+		if (of_setup_earlycon(match, offset, options) == 0)
+			return 0;
 	}
 	return -ENODEV;
 }