Rewrite the cxl_guest_init_afu() loop in cxl_of_probe() to use
for_each_child_of_node() rather than a hand-coded for loop.
Remove the useless of_node_put(afu_np) call after the loop, where it's
guaranteed that afu_np == NULL.
Reported-by: SF Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Reported-by: Julia Lawall <julia.lawall@xxxxxxx>
Signed-off-by: Andrew Donnellan <andrew.donnellan@xxxxxxxxxxx>