On the fourth time through the loop, the current element is 'd', so the
comparison pointer is set to 'd'.
The fifth time through the loop, the current element is 'c'.
'c'!='d', so go on
the sixth iteration gives 'd'
I may be wrong. Anyway, this is somewhat beside the point, as I'm sure
that Linus et al don't need anyone to tell them an algorithm to find a
loop in a linked list... ;^>
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