Seems fair to me. At best it was a reckless play. He was in no position to really be able to grab the puck.
To me it looked like he was initially reaching for the puck, but then took the opportunity to give Hossa a shot. It's hard to tell for sure because there's not a great camera angle of it that I've seen.
EDIT: actually, seeing the NHL suspension video I'm more convinced it was an intentional forearm.