of: return NUMA_NO_NODE from fallback of_node_to_nid()

Node 0 might be offline as well as any other numa node,
in this case kernel cannot handle memory allocation and crashes.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Fixes: 0c3f061c195c ("of: implement of_node_to_nid as a weak function")
Signed-off-by: Grant Likely <grant.likely@linaro.org>

diff --cc drivers/of/base.c
Simple merge

diff --cc include/linux/of.h
Simple merge