replace C-s with C-f

[Bruce Ingalls]

I bound C-f to isearch-forward, as follows:

  (global-set-key [(control s)] 'save-buffer)
  (global-set-key [(control f)] 'isearch-forward)

The bindings work, but when I want to continue a search,
by hitting C-f again, it instead stops & restarts the search.

C-g is generally bound to continuing a search, but I'd rather not
go that route.

What is the best way to handle this?