[Intel-wired-lan] [next-queue v2] ethernet/intel: Convert fallthrough code comments

[Joe Perches]

On Wed, 2020-06-03 at 20:07 -0700, Jeff Kirsher wrote:
> Convert all the remaining 'fall through" code comments to the newer
> 'fallthough;' keyword.

Maybe write it was scripted and

v2: removed unnecessary fallthrough; after break;