[PATCH v2] um: use swap() to make code cleaner

[David Laight]

From: Yang Guang
> Sent: 05 November 2021 06:19
> 
> Use the macro 'swap()' defined in 'include/linux/minmax.h' to avoid
> opencoding it.

Is there any real point to any of these patches??

If I'm reading a 'random' piece of code I now have to assume
that swap() is something that 'magically' exchanges two items.
This requires more brain-power than parsing the three lines
that do an actual swap.

	David

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