[PATCH 06/18] Make ft_node_add() accept and return NULL.

[Scott Wood]

Segher Boessenkool wrote:
> But doesn't ft_add_node() add a node to the tree?  If so,
> a NULL is most likely a program error. If not, some name
> change is in order /me thinks ;-)

No, it adds the node to the phandle->internal pointer lookup table (or 
returns the existing phandle if it's already there).  And yes, it could 
use a better name -- how about ft_node_to_phandle()?

-Scott