net: allwinner: Fix some resources leak in the error handling path of the probe and in the remove function

[Markus Elfring]

> It is likely that some improvement can be made, but it works pretty well
> for what I want.
>
> And I have a collection of alloc/free functions that I manually put in
> place of irq_of_parse_and_map and irq_dispose_mapping.

How do you think about to discuss further possible software extensions
for the mentioned source code search pattern?

Regards,
Markus