Make 'clear_dive()' free the primary dive computer data properly

Our primary dive computer really is special, not just because it's the
first one: it's directly embedded in the "struct dive", and so if you
just walk the divecomputer list, you'll miss it, because it's not _on_
the list, it is the very head _of_ the list.

We had that bug in copy_dive(), and it turns out we have it in
clear_dive() too: clear_dive() would free all the dive computers on the
list, but not the actual primary one.

This is a minor memory leak, no more, so it's not exactly critial, but
let's just do it right.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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