The recent ppc64 patch to use kref for device_node refcounting
introduced an unbalanced get/put in of_add_node which would cause
newly-added device nodes to be prematurely freed.  Sorry for the
screwup, a more rigorously tested fix follows.
Signed-off-by: Nathan Lynch <nathanl@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>