virTestCompareToULL: Rename local variables
virTestCompareToULL: Rename local variables

The current naming makes it hard for me to see which holds the
expected value and which holds the actual value. Rename them to
make it obvious.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

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