[PATCH] Fix a possible overflow case detected by gcc 4.3.2

[Jon Loeliger]

> .../dtc/libfdt/fdt_sw.c: In function 'fdt_end_node':
> .../dtc/libfdt/fdt_sw.c:81: error: assuming signed overflow does not occur when assuming that (X + c)
>  < X is always false
> 
> Signed-off-by: Emil Medve <Emilian.Medve at Freescale.com>

Applied.

Thanks,
jdl