Make add_single_dive() grow the divelist allocation if necessary

We only made sure the divelist allocation was big enough in
"record_dive_to_table()", but add_single_dive() can add entries too.

Now, in practice that never bit anybody, since

 (a) we allocate extra entries anyway, and it would be very unusual that
     the divelist table was exactly full

 (b) most "malloc()" implementations end up having their own slop on top
     of that

 (c) add_single_dive() was only used for merging dives, which actually
     ends up removing more divex than it adds (but it does add one first)

but when I'm starting to split dives, this will be a bigger issue in
practice.  And it was wrong.

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

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