Merge commit 'facdfe40'

* commit 'facdfe40':
  swscale: Add proper ff_ prefix to init functions

This commit is a noop, see e8c37160

I'm keeping our ff_sws_ vs ff_ since we use ff_sws_ in other places in
swscale.

Merged-by: Clément Bœsch <u@pkh.me>