Move 'dive_list_update_dives()' call into 'report_dives()'

All the callers were always calling report_dives first, followed by
dive_list_update_dives().  And there really was no reason to have the
callers call two separate functions for the "I've added new dives" case.
So just call dive_list_update_dives() directly from report_dives(), and
remove it from the callers.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>