Great freekick that.
90% of time, Messi hits on the right hand corner when the freekick is taken from right side of pitch (he mixes it when freekick is taken from centre or left side though). The goalkeeper did his typical routine - cover left side of goal and assume wall will do the job on right side. I feel it will be difficult for Messi to score if goalkeeper cover right side of goal and put wall to block left side of goal.
in another note, in free kick situations, Many times only thing the wall does is obstruct goalkeeper's sight. I wonder if its actually better not to line up the wall right in front of the ball or line up the wall making sure goalkeeper gets the sight of the ball all the way through. I always feel there must be some inventive way to block some of those freekicks though. maybe no, maybe yes.