CVE-2022-48672 of: fdt: fix off-by-one error in unflatten_dt_nodes()

In the Linux kernel, the following vulnerability has been resolved: of: fdt: fix off-by-one error in unflattendtnodes Commit 78c44d910d3e "drivers/of: Fix depth when unflattening devicetree" forgot to fix up the depth check in the loop body in unflattendtnodes which makes it possible to overflow...