software node: implement software_node_unregister()

Sometimes it is better to unregister individual nodes instead of trying
to do them all at once with software_node_unregister_nodes(), so create
software_node_unregister() so that you can unregister them one at a
time.

This is especially important when creating nodes in a hierarchy, with
parent -> children representations.  Children always need to be removed
before a parent is, as the swnode logic assumes this is going to be the
case.

Fix up the lib/test_printf.c fwnode_pointer() test which to use this new
function as it had the problem of tearing things down in the backwards
order.

Fixes: f1ce39df508d ("lib/test_printf: Add tests for %pfw printk modifier")
Cc: stable <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Brendan Higgins <[email protected]>
Cc: Dmitry Torokhov <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Rasmus Villemoes <[email protected]>
Cc: Sakari Ailus <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: Steven Rostedt <[email protected]>
Reported-by: Naresh Kamboju <[email protected]>
Reported-by: kernel test robot <[email protected]>
Reported-by: Randy Dunlap <[email protected]>
Tested-by: Petr Mladek <[email protected]>
Tested-by: Randy Dunlap <[email protected]>
Tested-by: Guenter Roeck <[email protected]>
Reviewed-by: Heikki Krogerus <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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